ARM: 6990/1: MAINTAINERS: add entry for ARM PMU profiling and debugging

ARM: 6990/1: MAINTAINERS: add entry for ARM PMU profiling and debugging

Following a request from Russell King:

http://lists.infradead.org/pipermail/linux-arm-kernel/2011-June/055031.html

Add myself as the ARM PMU profiling and debugging maintainer. This
covers the ARM implementations of perf, oprofile and hw_breakpoint along
with the glue for this to work on different platforms.

Cc: Jean Pihet <j-pihet@ti.com>
Acked-by: Jamie Iles <jamie@jamieiles.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>