W25Q256: Set to use 4-byte addressing

According to the datasheet, 256Mbit+ devices use 4-byte address mode.
Making sure that these settings are set approprately.

BUG=b:111689817
BRANCH=None
TEST=sudo emerge flashrom
     flash bios image onto dragonegg DUT and make sure no errors.
     Boot up DUT and make sure bios version is updated.

Change-Id: Id3b0142c477397536dddfdd616acde9d3b02b4f6
Signed-off-by: Shelley Chen <shchen@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1149267
Commit-Ready: Shelley Chen <shchen@chromium.org>
Tested-by: Shelley Chen <shchen@chromium.org>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
1 file changed