Convert CONFIG_MD5 to Kconfig

This converts the following to Kconfig:
   CONFIG_MD5

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/SBx81LIFKW_defconfig b/configs/SBx81LIFKW_defconfig
index 1669016..8988ed9 100644
--- a/configs/SBx81LIFKW_defconfig
+++ b/configs/SBx81LIFKW_defconfig
@@ -58,3 +58,4 @@
 CONFIG_SPI=y
 CONFIG_DM_SPI=y
 CONFIG_KIRKWOOD_SPI=y
+CONFIG_MD5=y
diff --git a/configs/SBx81LIFXCAT_defconfig b/configs/SBx81LIFXCAT_defconfig
index 3858143..cd491c4 100644
--- a/configs/SBx81LIFXCAT_defconfig
+++ b/configs/SBx81LIFXCAT_defconfig
@@ -60,3 +60,4 @@
 CONFIG_SPI=y
 CONFIG_DM_SPI=y
 CONFIG_KIRKWOOD_SPI=y
+CONFIG_MD5=y
diff --git a/include/configs/SBx81LIFKW.h b/include/configs/SBx81LIFKW.h
index 4ecff16..bf9f26e 100644
--- a/include/configs/SBx81LIFKW.h
+++ b/include/configs/SBx81LIFKW.h
@@ -16,7 +16,6 @@
 /* additions for new ARM relocation support */
 #define CONFIG_SYS_SDRAM_BASE	0x00000000
 
-#define CONFIG_MD5	/* get_random_hex on krikwood needs MD5 support */
 #define CONFIG_KIRKWOOD_EGIGA_INIT	/* Enable GbePort0/1 for kernel */
 #define CONFIG_KIRKWOOD_PCIE_INIT	/* Enable PCIE Port0 */
 #define CONFIG_KIRKWOOD_RGMII_PAD_1V8	/* Set RGMII Pad voltage to 1.8V */
diff --git a/include/configs/SBx81LIFXCAT.h b/include/configs/SBx81LIFXCAT.h
index 4e9f039..71394ae 100644
--- a/include/configs/SBx81LIFXCAT.h
+++ b/include/configs/SBx81LIFXCAT.h
@@ -16,7 +16,6 @@
 /* additions for new ARM relocation support */
 #define CONFIG_SYS_SDRAM_BASE	0x00000000
 
-#define CONFIG_MD5	/* get_random_hex on krikwood needs MD5 support */
 #define CONFIG_KIRKWOOD_EGIGA_INIT	/* Enable GbePort0/1 for kernel */
 #define CONFIG_KIRKWOOD_PCIE_INIT	/* Enable PCIE Port0 */
 #define CONFIG_KIRKWOOD_RGMII_PAD_1V8	/* Set RGMII Pad voltage to 1.8V */