dt-bindings: mfd: pm8008: Add IRQ listing

Add a header file listing all of the IRQs that Qualcomm Technologies,
Inc. PM8008 supports. The constants defined in this file may be used in
the client device tree node to specify interrupts.

Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>