Convert CONFIG_SYS_UNIFY_CACHE to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_UNIFY_CACHE

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/M53017EVB_defconfig b/configs/M53017EVB_defconfig
index 901a15d..cec2520 100644
--- a/configs/M53017EVB_defconfig
+++ b/configs/M53017EVB_defconfig
@@ -42,6 +42,7 @@
 CONFIG_SYS_FLASH_CFI=y
 CONFIG_DM_ETH=y
 CONFIG_MCFFEC=y
+CONFIG_SYS_UNIFY_CACHE=y
 CONFIG_MII=y
 CONFIG_MCFRTC=y
 CONFIG_SYS_MCFRTC_BASE=0xFC0A8000
diff --git a/configs/M5329AFEE_defconfig b/configs/M5329AFEE_defconfig
index 0bce9d8..9d55d50 100644
--- a/configs/M5329AFEE_defconfig
+++ b/configs/M5329AFEE_defconfig
@@ -41,6 +41,7 @@
 CONFIG_SYS_FLASH_CFI=y
 CONFIG_DM_ETH=y
 CONFIG_MCFFEC=y
+CONFIG_SYS_UNIFY_CACHE=y
 CONFIG_MII=y
 CONFIG_MCFRTC=y
 CONFIG_SYS_MCFRTC_BASE=0xFC0A8000
diff --git a/configs/M5329BFEE_defconfig b/configs/M5329BFEE_defconfig
index efc7733..bd0cbdd 100644
--- a/configs/M5329BFEE_defconfig
+++ b/configs/M5329BFEE_defconfig
@@ -43,6 +43,7 @@
 CONFIG_MTD_RAW_NAND=y
 CONFIG_DM_ETH=y
 CONFIG_MCFFEC=y
+CONFIG_SYS_UNIFY_CACHE=y
 CONFIG_MII=y
 CONFIG_MCFRTC=y
 CONFIG_SYS_MCFRTC_BASE=0xFC0A8000
diff --git a/configs/M5373EVB_defconfig b/configs/M5373EVB_defconfig
index 920a86f..0a159eb 100644
--- a/configs/M5373EVB_defconfig
+++ b/configs/M5373EVB_defconfig
@@ -43,6 +43,7 @@
 CONFIG_MTD_RAW_NAND=y
 CONFIG_DM_ETH=y
 CONFIG_MCFFEC=y
+CONFIG_SYS_UNIFY_CACHE=y
 CONFIG_MII=y
 CONFIG_MCFRTC=y
 CONFIG_SYS_MCFRTC_BASE=0xFC0A8000
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 40b5c82..cb891f5 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -409,6 +409,10 @@
 	  This driver supports the network interface units in the
 	  ColdFire family.
 
+config SYS_UNIFY_CACHE
+	depends on MCFFEC
+	bool "Invalidate icache during ethernet operations"
+
 config FSLDMAFEC
         bool "ColdFire DMA Ethernet Support"
 	depends on DM_ETH
diff --git a/include/configs/M53017EVB.h b/include/configs/M53017EVB.h
index b38260e..fd6aee1 100644
--- a/include/configs/M53017EVB.h
+++ b/include/configs/M53017EVB.h
@@ -22,8 +22,6 @@
 
 #define CONFIG_WATCHDOG_TIMEOUT		5000
 
-#define CONFIG_SYS_UNIFY_CACHE
-
 #ifdef CONFIG_MCFFEC
 #	define CONFIG_SYS_DISCOVER_PHY
 #	define CONFIG_SYS_TX_ETH_BUFFER	8
diff --git a/include/configs/M5329EVB.h b/include/configs/M5329EVB.h
index c65f26c..b7ccdd0 100644
--- a/include/configs/M5329EVB.h
+++ b/include/configs/M5329EVB.h
@@ -22,8 +22,6 @@
 
 #define CONFIG_WATCHDOG_TIMEOUT	5000	/* timeout in milliseconds, max timeout is 6.71sec */
 
-#define CONFIG_SYS_UNIFY_CACHE
-
 #ifdef CONFIG_MCFFEC
 #	define CONFIG_SYS_DISCOVER_PHY
 /* If CONFIG_SYS_DISCOVER_PHY is not defined - hardcoded */
diff --git a/include/configs/M5373EVB.h b/include/configs/M5373EVB.h
index 7e45d35..06ee074 100644
--- a/include/configs/M5373EVB.h
+++ b/include/configs/M5373EVB.h
@@ -24,8 +24,6 @@
 
 #define CONFIG_WATCHDOG_TIMEOUT	3360	/* timeout in ms, max is 3.36 sec */
 
-#define CONFIG_SYS_UNIFY_CACHE
-
 #ifdef CONFIG_MCFFEC
 #	define CONFIG_SYS_DISCOVER_PHY
 /* If CONFIG_SYS_DISCOVER_PHY is not defined - hardcoded */
diff --git a/include/configs/astro_mcf5373l.h b/include/configs/astro_mcf5373l.h
index 18e0607..a8265e9 100644
--- a/include/configs/astro_mcf5373l.h
+++ b/include/configs/astro_mcf5373l.h
@@ -65,8 +65,6 @@
 #define CONFIG_SYS_CORE_SRAM_SIZE	0x8000
 #define CONFIG_SYS_CORE_SRAM		0x80000000
 
-#define CONFIG_SYS_UNIFY_CACHE
-
 /*
  * Define baudrate for UART1 (console output, tftp, ...)
  * default value of CONFIG_BAUDRATE for Sentec board: 19200 baud