MAINTAINERS: remove swarren from bcm2835

I haven't been active in BCM2835 maintenance for quite a while; Eric's
been doing a great job. As such, remove myself from MAINTAINERS for that.
Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Eric Anholt <eric@anholt.net>

MAINTAINERS

@@ -2649,7 +2649,6 @@ N:	kona
 F:	arch/arm/mach-bcm/
 
 BROADCOM BCM2835 ARM ARCHITECTURE
-M:	Stephen Warren <swarren@wwwdotorg.org>
 M:	Lee Jones <lee@kernel.org>
 M:	Eric Anholt <eric@anholt.net>
 L:	linux-rpi-kernel@lists.infradead.org (moderated for non-subscribers)