mtd: nand: arasan_nfc: Add support for nand multi chip select

This patch adds support for nand multi chip select.
Also adding CONFIG_SYS_NAND_MAX_CHIPS to Kconfig to specify maximum number
of nand chips.

Signed-off-by: Tummala Karthik Reddy <t.karthik.reddy@xilinx.com>
Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index 6d46660..7f76e5e 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -299,6 +299,13 @@
 	    not available while configuring controller. So a static CONFIG_NAND_xx
 	    is needed to know the device's bus-width in advance.
 
+config SYS_NAND_MAX_CHIPS
+	int "NAND max chips"
+	default 1
+	depends on NAND_ARASAN
+	help
+	  The maximum number of NAND chips per device to be supported.
+
 if SPL
 
 config SYS_NAND_U_BOOT_LOCATIONS