emulation/qemu-armv7: Fix wrong stack parameters.

Now it boots up to message "Could not find payload".

Change-Id: I07ddca7046492f7e0dec15a8ea00c2870b09ee67
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4754
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

src/mainboard/emulation/qemu-armv7/Kconfig

@@ -88,10 +88,18 @@ config CBFS_ROM_OFFSET
 	hex
 	default 0x0110000
 
-config IRAM_STACK
+config STACK_TOP
 	hex
 	default 0x0007ff00
 
+config STACK_BOTTOM
+	hex
+	default 0x00040000
+
+config STACK_SIZE
+	hex
+	default 0x0003ff00
+
 config XIP_ROM_SIZE
 	hex
 	default ROMSTAGE_SIZE