MAINTAINERS: add to pxa files pinctrl

Add the pinctrl pxa drivers to the pxa maintained files.
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

MAINTAINERS

@@ -8613,6 +8613,7 @@ S:	Maintained
 F:	arch/arm/mach-pxa/
 F:	drivers/dma/pxa*
 F:	drivers/pcmcia/pxa2xx*
+F:	drivers/pinctrl/pxa/
 F:	drivers/spi/spi-pxa2xx*
 F:	drivers/usb/gadget/udc/pxa2*
 F:	include/sound/pxa2xx-lib.h