Enable support for the ARM Performance Monitor Units in the Cortex-A9
CPU core on RZ/A1H by adding a device node for the PMU.

New Linux output:

    hw perfevents: enabled with armv7_cortex_a9 PMU driver, 7 counters available
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>