MAINTAINERS: update maintained files for Rockchip

With some of the recent cleanups (e.g. moving the DRAM controller
drivers for Rockchip devices to drivers/ram/rockchip), the files
and paths listed in MAINTAINERS no longer covered what really is
looked after as part of the Rockchip port.

This commit updates the files/paths listed in MAINTAINERS for the
Rockchip port.  I am certain, though, that this will have missed some
additional paths that should have been included...

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

MAINTAINERS

@@ -143,8 +143,20 @@ M:	Simon Glass <sjg@chromium.org>
 M:	Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
 S:	Maintained
 T:	git git://git.denx.de/u-boot-rockchip.git
+F:	arch/arm/include/asm/arch-rockchip/
 F:	arch/arm/mach-rockchip/
 F:	board/rockchip/
+F:	drivers/clk/rockchip/
+F:	drivers/gpio/rk_gpio.c
+F:	drivers/misc/rockchip-efuse.c
+F:	drivers/pinctrl/rockchip/
+F:	drivers/ram/rockchip/
+F:	drivers/sysreset/sysreset_rockchip.c
+F:	tools/rkcommon.c
+F:	tools/rkcommon.h
+F:	tools/rkimage.c
+F:	tools/rksd.c
+F:	tools/rkspi.c
 
 ARM SAMSUNG
 M:	Minkyu Kang <mk7.kang@samsung.com>