MAINTAINERS, git-mailrc: Update the mmc maintainer

Update the mmc maintainer from Jaehoon to me.

Cc: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Acked-by: Marek Vasut <marex@denx.de>
2 files changed