Convert CONFIG_SYS_FSL_NUM_CC_PLLS to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_FSL_NUM_CC_PLLS

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/ls1028ardb_tfa_defconfig b/configs/ls1028ardb_tfa_defconfig
index c953706..269dd63 100644
--- a/configs/ls1028ardb_tfa_defconfig
+++ b/configs/ls1028ardb_tfa_defconfig
@@ -17,6 +17,7 @@
 CONFIG_SEC_FIRMWARE_ARMV8_PSCI=y
 CONFIG_ENV_ADDR=0x20500000
 CONFIG_AHCI=y
+CONFIG_SYS_FSL_NUM_CC_PLLS=3
 CONFIG_FSL_QIXIS=y
 CONFIG_SYS_MEMTEST_START=0x80000000
 CONFIG_SYS_MEMTEST_END=0x9fffffff