Support GL9763E as a eMMC boot disk BUG=b:210089379 TEST=enable DRIVERS_GENESYSLOGIC_GL9763E and check eMMC on taniks. Signed-off-by: Joey Peng <joey.peng@lcfc.corp-partner.google.com> Change-Id: Iab0fd88ac88e07a8580426234adc9c21df6c11d6 Reviewed-on: https://review.coreboot.org/c/coreboot/+/60023 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>