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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: Boris BREZILLON <b.brezillon@overkiz.com>
Acked-by: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>