MAINTAINERS: add new folders into IMX entry

Add new created folders drivers/clk/imx/ and include/soc/imx/ into IMX
entry.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

MAINTAINERS

@@ -1039,6 +1039,8 @@ F:	arch/arm/mach-imx/
 F:	arch/arm/mach-mxs/
 F:	arch/arm/boot/dts/imx*
 F:	arch/arm/configs/imx*_defconfig
+F:	drivers/clk/imx/
+F:	include/soc/imx/
 
 ARM/FREESCALE VYBRID ARM ARCHITECTURE
 M:	Shawn Guo <shawn.guo@linaro.org>