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/zynq_cse_qspi_defconfig b/configs/zynq_cse_qspi_defconfig
index 924d4b1..4482a32 100644
--- a/configs/zynq_cse_qspi_defconfig
+++ b/configs/zynq_cse_qspi_defconfig
@@ -27,6 +27,7 @@
 # CONFIG_DISPLAY_CPUINFO is not set
 # CONFIG_ARCH_EARLY_INIT_R is not set
 # CONFIG_BOARD_LATE_INIT is not set
+CONFIG_CLOCKS=y
 CONFIG_SPL_STACK_R=y
 CONFIG_SPL_SPI_LOAD=y
 CONFIG_SYS_SPI_U_BOOT_OFFS=0x100000