MAITAINERS: Change zonefs maintainer email address

Update my email address from damien.lemoal@wdc.com to
damien.lemoal@opensource.wdc.com.

Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>

MAINTAINERS

@@ -21059,7 +21059,7 @@ S:	Maintained
 F:	arch/x86/kernel/cpu/zhaoxin.c
 ZONEFS FILESYSTEM
-M:	Damien Le Moal <damien.lemoal@wdc.com>
+M:	Damien Le Moal <damien.lemoal@opensource.wdc.com>
 M:	Naohiro Aota <naohiro.aota@wdc.com>
 R:	Johannes Thumshirn <jth@kernel.org>
 L:	linux-fsdevel@vger.kernel.org