MAINTAINERS: exfat: update my email address

My email address in exfat entry will be not available in a few days.
Update it to my own kernel.org address.

Link: https://lkml.kernel.org/r/20210825044833.16806-1-namjae.jeon@samsung.comSigned-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -6955,7 +6955,7 @@ F:	include/uapi/linux/mdio.h
 F:	include/uapi/linux/mii.h
 
 EXFAT FILE SYSTEM
-M:	Namjae Jeon <namjae.jeon@samsung.com>
+M:	Namjae Jeon <linkinjeon@kernel.org>
 M:	Sungjong Seo <sj1557.seo@samsung.com>
 L:	linux-fsdevel@vger.kernel.org
 S:	Maintained