xtensa: nommu: fix uImage load address

Use the same offset from the default physical memory start address as in
LOAD_MEMORY_ADDRESS definition.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

arch/xtensa/boot/boot-uboot/Makefile

@@ -4,11 +4,15 @@
 # for more details.
 #
 
+ifdef CONFIG_MMU
 ifdef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
 UIMAGE_LOADADDR = 0x00003000
 else
 UIMAGE_LOADADDR = 0xd0003000
 endif
+else
+UIMAGE_LOADADDR = $(shell printf "0x%x" $$(( ${CONFIG_DEFAULT_MEM_START} + 0x3000 )) )
+endif
 UIMAGE_COMPRESSION = gzip
 
 $(obj)/../uImage: vmlinux.bin.gz FORCE