MAINTAINERS: add entry for Freescale SoC drivers

Add maintainer entry for Freescale SoC drivers including
the QE library and the GUTS driver now. Also add maintainer
for QE library.

Signed-off-by: Yangbo Lu <[e-mail]>
Acked-by: Scott Wood <[e-mail]>
Acked-by: Qiang Zhao <[e-mail]>
Acked-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Ulf Hansson <[e-mail]>

MAINTAINERS

···
 F:	drivers/net/ethernet/freescale/fman
 F:	Documentation/devicetree/bindings/powerpc/fsl/fman.txt
 
-FREESCALE QUICC ENGINE LIBRARY
+FREESCALE SOC DRIVERS
+M:	Scott Wood <[e-mail]>
 L:	[e-mail]
-S:	Orphan
+L:	[e-mail]
+S:	Maintained
+F:	drivers/soc/fsl/
+F:	include/linux/fsl/
+
+FREESCALE QUICC ENGINE LIBRARY
+M:	Qiang Zhao <[e-mail]>
+L:	[e-mail]
+S:	Maintained
 F:	drivers/soc/fsl/qe/
 F:	include/soc/fsl/*qe*.h
 F:	include/soc/fsl/*ucc*.h