MAINTAINERS: merge at91 pinctrl entries

In order to be aware of all changes related to at91 pinctrl drivers,
merge the two entries. Make use of the opportunity to replace Atmel by
Microchip.
Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

MAINTAINERS

@@ -11703,18 +11703,12 @@ F:	Documentation/driver-api/pinctl.rst
 F:	drivers/pinctrl/
 F:	include/linux/pinctrl/
 
-PIN CONTROLLER - ATMEL AT91
-M:	Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
-L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
-S:	Maintained
-F:	drivers/pinctrl/pinctrl-at91.*
-
-PIN CONTROLLER - ATMEL AT91 PIO4
+PIN CONTROLLER - MICROCHIP AT91
 M:	Ludovic Desroches <ludovic.desroches@microchip.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 L:	linux-gpio@vger.kernel.org
 S:	Supported
-F:	drivers/pinctrl/pinctrl-at91-pio4.*
+F:	drivers/pinctrl/pinctrl-at91*
 
 PIN CONTROLLER - FREESCALE
 M:	Dong Aisheng <aisheng.dong@nxp.com>