MAINTAINERS: Update Stefan Wahren email address

I2SE has been acquired, so i decided to use my private address now.
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

MAINTAINERS

@@ -3109,7 +3109,7 @@ F:	arch/arm/mach-bcm/
 
 BROADCOM BCM2835 ARM ARCHITECTURE
 M:	Eric Anholt <eric@anholt.net>
-M:	Stefan Wahren <stefan.wahren@i2se.com>
+M:	Stefan Wahren <wahrenst@gmx.net>
 L:	linux-rpi-kernel@lists.infradead.org (moderated for non-subscribers)
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 T:	git git://github.com/anholt/linux