Chromebook have some platform need support MICMUTE and KBDILLUMTOGGLE. BUG=b:194146863 BRANCH=none TEST=check on evtest type 4 (EV_MSC), code 4 (MSC_SCAN), value ab type 1 (EV_KEY), code 228 (KEY_KBDILLUMTOGGLE), 1 type 4 (EV_MSC), code 4 (MSC_SCAN), value 9b type 1 (EV_KEY), code 248 (KEY_MICMUTE), value 1 Signed-off-by: Scott Chao <scott_chao@wistron.corp-partner.google.com> Change-Id: Ic39ecb3118e885c9e6d84d7b78bf435cb903d17e Reviewed-on: https://review.coreboot.org/c/coreboot/+/56709 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Lance Zhao