MAINTAINERS, git-mailrc: Update the mmc maintainer

Update the mmc maintainer from Pantelis to me.

Acked-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 1225ce2..8905f88 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -299,7 +299,7 @@
 F:	arch/mips/
 
 MMC
-M:	Pantelis Antoniou <panto@antoniou-consulting.com>
+M:	Jaehoon Chung <jh80.chung@samsung.com>
 S:	Maintained
 T:	git git://git.denx.de/u-boot-mmc.git
 F:	drivers/mmc/