MAINTAINERS: Drop drivers/sh/ for Renesas ARM

None of the code under drivers/sh/ is used anymore on Renesas ARM.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

MAINTAINERS

@@ -1664,7 +1664,6 @@ F:	arch/arm/boot/dts/sh*
 F:	arch/arm/configs/shmobile_defconfig
 F:	arch/arm/include/debug/renesas-scif.S
 F:	arch/arm/mach-shmobile/
-F:	drivers/sh/
 F:	drivers/soc/renesas/
 F:	include/linux/soc/renesas/