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/socfpga_arria10_defconfig b/configs/socfpga_arria10_defconfig
index ad1bdbe..1be9a2d 100644
--- a/configs/socfpga_arria10_defconfig
+++ b/configs/socfpga_arria10_defconfig
@@ -23,6 +23,7 @@
 CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE=y
 CONFIG_SYS_CONSOLE_ENV_OVERWRITE=y
 CONFIG_DISPLAY_BOARDINFO_LATE=y
+CONFIG_CLOCKS=y
 CONFIG_SPL_ENV_SUPPORT=y
 CONFIG_SPL_FPGA=y
 CONFIG_CMD_ASKENV=y