disk/gpt: Fix GPT partition handling for blocksize != 512

Disks beyond 2T in size use blocksizes of 4096 bytes. However a lot of
code in u-boot  still assumes a 512 byte blocksize.
This patch fixes the handling of GPTs.

Signed-off-by: Egbert Eich <eich@suse.com>

	Taken from 2014.01

Change-Id: Ibb385121545488c0c4679fd428d6346abb1848e4
Signed-off-by: Eli Nidam <elini@marvell.com>
Reviewed-on: http://vgitil04.il.marvell.com:8080/5721
4 files changed