arm: mach-k3: Set NR_DRAM_BANKS to 2

Set CONFIG_NR_DRAM_BANKS to 2 as we have two banks described in the
memory/ node for lower and higher addressible DDR regions.

This allows use of FDT functions from fdt_support.c to set up and fix up
the memory/ node correctly.

Signed-off-by: Neha Malcom Francis <n-francis@ti.com>
Signed-off-by: Santhosh Kumar K <s-k6@ti.com>
diff --git a/arch/arm/mach-k3/Kconfig b/arch/arm/mach-k3/Kconfig
index f3f42b3..a3ac490 100644
--- a/arch/arm/mach-k3/Kconfig
+++ b/arch/arm/mach-k3/Kconfig
@@ -156,6 +156,9 @@
 	help
 	  SWRV for X509 certificate used for boot images
 
+config NR_DRAM_BANKS
+	default 2
+
 if CPU_V7R
 source "arch/arm/mach-k3/r5/Kconfig"
 endif