arm64: zynqmp: Set initrd_high to as high as possible

This patch is setting up the initrd_high to as high as possible by leaving
max stack size for u-boot so that bigger rootfs can also be loaded by
u-boot for booting kernel.

Signed-off-by: T 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/arch/arm/Kconfig b/arch/arm/Kconfig
index 33cb3e0..257a98d 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -464,7 +464,7 @@
 
 config SET_STACK_SIZE
 	bool "Enable an option to set max stack size that can be used"
-	default y if ARCH_VERSAL
+	default y if ARCH_VERSAL || ARCH_ZYNQMP
 	help
 	  This will enable an option to set max stack size that can be
 	  used by u-boot.
@@ -472,7 +472,7 @@
 config STACK_SIZE
 	hex "Define max stack size that can be used by u-boot"
 	depends on SET_STACK_SIZE
-	default 0x4000000 if ARCH_VERSAL
+	default 0x4000000 if ARCH_VERSAL || ARCH_ZYNQMP
 	help
 	  Defines Max stack size that can be used by u-boot so that the
 	  initrd_high will be calculated as base stack pointer minus this