payloads/tianocore: Pass SD_MMC_TIMEOUT build option

By default, edk2 allows 1000000μs for SD Card Readers and eMMC to
initialize which is excessive and causes a boot delay. This makes
the value configurable and uses a default of 1000μs which is sufficient
for the majority of readers. The value of 1000μs was hardcoded in
MrChromeBox's fork for around 2 years with no reported issues.

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: I873bcddf6f37a9eaae5c84991b3996d51fb460d3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61902
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

0 files changed, 0 insertions, 0 deletions