am335x: Revert how the header load size is calculated to an earlier method.

The current method will treat hex values as 0 and would calculate the wrong
size. This change switches back to an earlier method which used shell syntax
to add the offset and size.

Change-Id: I9fb2d9b323f113cc56a5ad2e38b47d2d22084f08
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: http://review.coreboot.org/3432
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
1 file changed