cmd/fdt.c align data buffer to avoid unaligned word access

Since the compiler is free to place a char array to any address in
memory (in this case the stack), also to a non word aligned address the
function "fdt_prop_parse" runs into troubles upon it wants to write some
(fdt32_t *) to such a variable (if it has been placed to a none word
aligned address).

To avoid this we tell the compiler to always align this scratchpad to a
word aligned address.

Signed-off-by: Bernhard Messerklinger <bernhard.messerklinger@br-automation.com>
Reviewed-by: Hannes Schmelzer <oe5hpm@oevsv.at>
Tested-by: Hannes Schmelzer <oe5hpm@oevsv.at>
Reviewed-by: Simon Glass <sjg@chromium.org>

cmd/fdt.c

@@ -256,7 +256,7 @@ static int do_fdt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 		char *pathp;		/* path */
 		char *prop;		/* property */
 		int  nodeoffset;	/* node offset from libfdt */
-		static char data[SCRATCHPAD];	/* storage for the property */
+		static char data[SCRATCHPAD] __aligned(4);/* property storage */
 		const void *ptmp;
 		int  len;		/* new length of the property */
 		int  ret;		/* return value */