Convert CONFIG_CHIP_SELECTS_PER_CTRL to Kconfig

This converts the following to Kconfig:
   CONFIG_CHIP_SELECTS_PER_CTRL

Cc: Alison Wang <alison.wang@nxp.com>
Cc: Pramod Kumar <pramod.kumar_1@nxp.com>
Cc: Priyanka Jain <priyanka.jain@nxp.com>
Cc: Rajesh Bhagat <rajesh.bhagat@nxp.com>
Cc: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/socrates_defconfig b/configs/socrates_defconfig
index 034d299..e24be7a 100644
--- a/configs/socrates_defconfig
+++ b/configs/socrates_defconfig
@@ -46,6 +46,7 @@
 CONFIG_ENV_ADDR=0xFFF40000
 CONFIG_ENV_ADDR_REDUND=0xFFF20000
 CONFIG_DM=y
+CONFIG_CHIP_SELECTS_PER_CTRL=2
 CONFIG_SYS_BR0_PRELIM_BOOL=y
 CONFIG_SYS_BR0_PRELIM=0xFE001001
 CONFIG_SYS_OR0_PRELIM=0xFE000030