uboot-imx

fdt_resize(): ensure minimum padding

fdt_add_mem_rsv() requires space for a struct fdt_reserve_entry
(16 bytes), so make sure that fdt_resize at least adds that much
padding, no matter what the location or size of the fdt is.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Acked-by: Andy Fleming <afleming@freescale.com>