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>
diff --git a/doc/git-mailrc b/doc/git-mailrc
index 1313701..7d0e8b5 100644
--- a/doc/git-mailrc
+++ b/doc/git-mailrc
@@ -22,6 +22,7 @@
 alias danielschwierzeck Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
 alias dinh           Dinh Nguyen <dinguyen@kernel.org>
 alias hs             Heiko Schocher <hs@denx.de>
+alias freenix        Peng Fan <peng.fan@nxp.com>
 alias iwamatsu       Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
 alias jaehoon        Jaehoon Chung <jh80.chung@samsung.com>
 alias jagan          Jagan Teki <jagan@amarulasolutions.com>
@@ -110,7 +111,7 @@
 alias fdt            uboot, sjg
 alias i2c            uboot, hs
 alias kconfig        uboot, masahiro
-alias mmc            uboot, jaehoon
+alias mmc            uboot, freenix
 alias nand           uboot
 alias net            uboot, jhersh
 alias phy            uboot, jhersh