MAINTAINERS: Add Geert as Renesas SoC Co-Maintainer

At the end of the v5.3 upstream kernel development cycle, Simon will be
stepping down from his role as Renesas SoC maintainer.  Starting with
the v5.4 development cycle, Geert is taking over this role.

Add Geert as a co-maintainer, and add his git repository and branch.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -2155,10 +2155,12 @@ F:	Documentation/devicetree/bindings/arm/realtek.txt
 
 ARM/RENESAS ARM64 ARCHITECTURE
 M:	Simon Horman <horms@verge.net.au>
+M:	Geert Uytterhoeven <geert+renesas@glider.be>
 M:	Magnus Damm <magnus.damm@gmail.com>
 L:	linux-renesas-soc@vger.kernel.org
 Q:	http://patchwork.kernel.org/project/linux-renesas-soc/list/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas.git next
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-devel.git next
 S:	Supported
 F:	arch/arm64/boot/dts/renesas/
 F:	Documentation/devicetree/bindings/arm/renesas.yaml
@@ -2269,10 +2271,12 @@ F:	drivers/media/platform/s5p-mfc/
 
 ARM/SHMOBILE ARM ARCHITECTURE
 M:	Simon Horman <horms@verge.net.au>
+M:	Geert Uytterhoeven <geert+renesas@glider.be>
 M:	Magnus Damm <magnus.damm@gmail.com>
 L:	linux-renesas-soc@vger.kernel.org
 Q:	http://patchwork.kernel.org/project/linux-renesas-soc/list/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas.git next
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-devel.git next
 S:	Supported
 F:	arch/arm/boot/dts/emev2*
 F:	arch/arm/boot/dts/gr-peach*