trembyle: define the IOEX_USB_A0_RETIMER_EN pin
trembyle: define the IOEX_USB_A0_RETIMER_EN pin

BUG=b:138600691
BRANCH=none
TEST=make buildall -j

Change-Id: I4083e501e76a626370ebb36fa05418af532f3bc7
Signed-off-by: Denis Brockus <6b21e8190fb5e373363fb95271367073a16474ef@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1850192
Commit-Queue: Edward Hill <db1406b34e091703092b6b136bdfeb2c8125fc0e@chromium.org>
Reviewed-by: Edward Hill <db1406b34e091703092b6b136bdfeb2c8125fc0e@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec