Convert CONFIG_CPU_FREQ_HZ to Kconfig

This converts the following to Kconfig:
   CONFIG_CPU_FREQ_HZ

Cc: Michal Simek <monstr@monstr.eu>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/mach-zynqmp-r5/Kconfig b/arch/arm/mach-zynqmp-r5/Kconfig
index 5e01754..f14514b 100644
--- a/arch/arm/mach-zynqmp-r5/Kconfig
+++ b/arch/arm/mach-zynqmp-r5/Kconfig
@@ -21,6 +21,12 @@
 	  Based on this option include/configs/<CONFIG_SYS_CONFIG_NAME>.h header
 	  will be used for board configuration.
 
+config CPU_FREQ_HZ
+	int "CPU frequency"
+	default 800000000
+	help
+	  The value, in Hz, that the CPU clock is running at.
+
 config SYS_MALLOC_F_LEN
 	default 0x600
 
diff --git a/configs/xilinx_zynqmp_r5_defconfig b/configs/xilinx_zynqmp_r5_defconfig
index a9c3c4a..98f46cf 100644
--- a/configs/xilinx_zynqmp_r5_defconfig
+++ b/configs/xilinx_zynqmp_r5_defconfig
@@ -9,6 +9,7 @@
 CONFIG_DEFAULT_DEVICE_TREE="zynqmp-r5"
 CONFIG_DEBUG_UART_BASE=0xff010000
 CONFIG_DEBUG_UART_CLOCK=100000000
+CONFIG_CPU_FREQ_HZ=500000000
 CONFIG_DEBUG_UART=y
 CONFIG_SYS_LOAD_ADDR=0x0
 CONFIG_BOOTSTAGE=y
diff --git a/include/configs/xilinx_zynqmp_r5.h b/include/configs/xilinx_zynqmp_r5.h
index 6d5b81e..3ec99e0 100644
--- a/include/configs/xilinx_zynqmp_r5.h
+++ b/include/configs/xilinx_zynqmp_r5.h
@@ -8,9 +8,6 @@
 
 #define CONFIG_EXTRA_ENV_SETTINGS
 
-/* CPU clock */
-#define CONFIG_CPU_FREQ_HZ	500000000
-
 /* Serial drivers */
 /* The following table includes the supported baudrates */
 #define CONFIG_SYS_BAUDRATE_TABLE  \
diff --git a/include/configs/zynq-common.h b/include/configs/zynq-common.h
index 8f8a9c7..88c6490 100644
--- a/include/configs/zynq-common.h
+++ b/include/configs/zynq-common.h
@@ -9,11 +9,6 @@
 #ifndef __CONFIG_ZYNQ_COMMON_H
 #define __CONFIG_ZYNQ_COMMON_H
 
-/* CPU clock */
-#ifndef CONFIG_CPU_FREQ_HZ
-# define CONFIG_CPU_FREQ_HZ	800000000
-#endif
-
 #define CONFIG_REMAKE_ELF
 
 /* Cache options */