MAINTAINERS: add a new reviewer for S32G

Add the NXP S32 Linux team as a designated review group of s32g.
Signed-off-by: Chester Lin <clin@suse.com>
Link: https://lore.kernel.org/r/20220525161422.14156-1-clin@suse.com

MAINTAINERS

@@ -2467,6 +2467,7 @@ ARM/NXP S32G ARCHITECTURE
 M:	Chester Lin <clin@suse.com>
 R:	Andreas Färber <afaerber@suse.de>
 R:	Matthias Brugger <mbrugger@suse.com>
+R:	NXP S32 Linux Team <s32@nxp.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 F:	arch/arm64/boot/dts/freescale/s32g*.dts*