MAINTAINERS: ARM: at91: update entry for ARM/Microchip

Change the entry name and move it to its alphabetical location.
We move to ARM/Microchip instead of ARM/ATMEL to reflect the merger
that is now nearly 2 years old.
AT91 is kept as the identity of our community. The atmel pattern is
obviously kept as well. I removed the names of the different SoCs as
they are better exposed in the arch/arm/mach-at91/Kconfig entries.

Signed-off-by: Nicolas Ferre <[e-mail]>
Signed-off-by: Alexandre Belloni <[e-mail]>

MAINTAINERS

···
 S:	Maintained
 F:	drivers/clk/at91
 
-ARM/ATMEL AT91RM9200, AT91SAM9 AND SAMA5 SOC SUPPORT
-M:	Nicolas Ferre <[e-mail]>
-M:	Alexandre Belloni <[e-mail]>
-L:	[e-mail] (moderated for non-subscribers)
-W:	http://www.linux4sam.org
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/nferre/linux-at91.git
-S:	Supported
-N:	at91
-N:	atmel
-F:	arch/arm/mach-at91/
-F:	include/soc/at91/
-F:	arch/arm/boot/dts/at91*.dts
-F:	arch/arm/boot/dts/at91*.dtsi
-F:	arch/arm/boot/dts/sama*.dts
-F:	arch/arm/boot/dts/sama*.dtsi
-F:	arch/arm/include/debug/at91.S
-F:	drivers/memory/atmel*
-F:	drivers/watchdog/sama5d4_wdt.c
-X:	drivers/input/touchscreen/atmel_mxt_ts.c
-X:	drivers/net/wireless/atmel/
-
 ARM/CALXEDA HIGHBANK ARCHITECTURE
 M:	Rob Herring <[e-mail]>
 L:	[e-mail] (moderated for non-subscribers)
···
 L:	[e-mail] (moderated for non-subscribers)
 F:	arch/arm/mach-ks8695/
 S:	Odd Fixes
+
+ARM/Microchip (AT91) SoC support
+M:	Nicolas Ferre <[e-mail]>
+M:	Alexandre Belloni <[e-mail]>
+L:	[e-mail] (moderated for non-subscribers)
+W:	http://www.linux4sam.org
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/nferre/linux-at91.git
+S:	Supported
+N:	at91
+N:	atmel
+F:	arch/arm/mach-at91/
+F:	include/soc/at91/
+F:	arch/arm/boot/dts/at91*.dts
+F:	arch/arm/boot/dts/at91*.dtsi
+F:	arch/arm/boot/dts/sama*.dts
+F:	arch/arm/boot/dts/sama*.dtsi
+F:	arch/arm/include/debug/at91.S
+F:	drivers/memory/atmel*
+F:	drivers/watchdog/sama5d4_wdt.c
+X:	drivers/input/touchscreen/atmel_mxt_ts.c
+X:	drivers/net/wireless/atmel/
 
 ARM/MIOA701 MACHINE SUPPORT
 M:	Robert Jarzmik <[e-mail]>