arm64: Add missing GD_FLG_SKIP_RELOC handling

In case U-Boot enters relocation with GD_FLG_SKIP_RELOC, skip the
relocation. The code still has to set up new_gd pointer and new
stack pointer.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Tom Rini <trini@konsulko.com>

lib/asm-offsets.c

@@ -29,6 +29,9 @@ int main(void)
 	DEFINE(GD_SIZE, sizeof(struct global_data));
 
 	DEFINE(GD_BD, offsetof(struct global_data, bd));
+
+	DEFINE(GD_FLAGS, offsetof(struct global_data, flags));
+
 #if CONFIG_VAL(SYS_MALLOC_F_LEN)
 	DEFINE(GD_MALLOC_BASE, offsetof(struct global_data, malloc_base));
 #endif