MAINTAINERS: drop entry for VIA SD/MMC controller

EMail addresses of both maintainers bounce. Since there have been only
cleanups for the last 10 years, let it fall back to the default MMC
entry.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20240621101833.24703-2-wsa+renesas@sang-engineering.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>