MAINTAINERS: Update email-id of Rahul Bedarkar

I'm no longer with Imagination Technologies. I am still interested in
maintaining or reviewing DTS patches for Ci40 if any. Update email-id
to an active one.
Signed-off-by: NRahul Bedarkar <rahulbedarkar89@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/15990/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

MAINTAINERS

@@ -7802,7 +7802,7 @@ L:	linux-man@vger.kernel.org
 S:	Maintained
 
 MARDUK (CREATOR CI40) DEVICE TREE SUPPORT
-M:	Rahul Bedarkar <rahul.bedarkar@imgtec.com>
+M:	Rahul Bedarkar <rahulbedarkar89@gmail.com>
 L:	linux-mips@linux-mips.org
 S:	Maintained
 F:	arch/mips/boot/dts/img/pistachio_marduk.dts