Lars: increase RO image size
Lars: increase RO image size

Following kunimitsu setting of
	https://chromium-review.googlesource.com/#/c/310581/

BUG=None
BRANCH=lars
TEST=`make buildall -j`

Change-Id: I4e58c581f7d3dfe4a6064a6d339806d543f41e23
Signed-off-by: Ryan Zhang <50a92783d595cae957ab2a2aa8dfe1aa1d9433fd@quantatw.com>
Reviewed-on: https://chromium-review.googlesource.com/311920
Reviewed-by: Shawn N <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>

akappy7/ChromeOS_EC_LED_Diagnostics,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec