This patch adds a new macro file for PMC macros.

This macro file includes the definitions of SR (status register) bit
offsets and will be use to reference PMC irqs.
Signed-off-by: NBoris BREZILLON <b.brezillon@overkiz.com>
Acked-by: NMike Turquette <mturquette@linaro.org>
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>