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/P1010RDB-PB_SPIFLASH_defconfig b/configs/P1010RDB-PB_SPIFLASH_defconfig
index cbe6df6..510ff5e 100644
--- a/configs/P1010RDB-PB_SPIFLASH_defconfig
+++ b/configs/P1010RDB-PB_SPIFLASH_defconfig
@@ -55,6 +55,7 @@
 CONFIG_SYS_SATA_MAX_DEVICE=2
 CONFIG_FSL_CAAM=y
 CONFIG_DDR_CLK_FREQ=66666666
+CONFIG_CHIP_SELECTS_PER_CTRL=1
 CONFIG_DM_I2C=y
 CONFIG_SPL_SYS_I2C_LEGACY=y
 CONFIG_I2C_SET_DEFAULT_BUS_NUM=y