spmi: qpnp-int: move qpnp-int.h under include/linux/irqchip

The qpnp-int.h header file resides under mach-msm's include directory.
qpnp-int is a irq controller driver and so should reside in
include/linux/irqchip. Move it there.

Change-Id: Ic3e427c44a15132c4d909eb2d4d688634995d30f
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>