em100: Add ability to update spi flash with given start address.

Add an option to load file to a given start address in the spi
flash and keep the rest of content unchanged.

Change-Id: I645db8155d32a3832d99840886d68e4522b66bdb
Signed-off-by: Tsung Ho Wu <tsung@amazon.com>
Reviewed-on: https://review.coreboot.org/c/30938
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
1 file changed