Convert CONFIG_CLOCKS to Kconfig

This converts the following to Kconfig:
   CONFIG_CLOCKS

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/topic_miamiplus_defconfig b/configs/topic_miamiplus_defconfig
index ce6e1e2..4c9dfc4 100644
--- a/configs/topic_miamiplus_defconfig
+++ b/configs/topic_miamiplus_defconfig
@@ -24,6 +24,7 @@
 CONFIG_BOOTDELAY=0
 CONFIG_BOOTCOMMAND="if mmcinfo; then if fatload mmc 0 0x1900000 ${bootscript}; then source 0x1900000; fi; fi; run $modeboot"
 CONFIG_USE_PREBOOT=y
+CONFIG_CLOCKS=y
 CONFIG_SPL_STACK_R=y
 CONFIG_SPL_SPI_LOAD=y
 CONFIG_SYS_SPI_U_BOOT_OFFS=0x20000