ARM: u300: move timer driver to clocksource

Move the U300 timer driver down to the clocksource driver
subsystem and keep arch/arm clean.

Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index b2cf5cf..edd6139 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1319,6 +1319,7 @@
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Supported
 F:	arch/arm/mach-u300/
+F:	drivers/clocksource/timer-u300.c
 F:	drivers/i2c/busses/i2c-stu300.c
 F:	drivers/rtc/rtc-coh901331.c
 F:	drivers/watchdog/coh901327_wdt.c