arm: msm: switch to using irqchip_init

irqchip_init initializes irq controllers declared with IRQCHIP_DECLARE
macro. Enable the option that declares qpnp-int and gpio irq chips using
IRQCHIP_DECLARE. Consequently, remove all the instances of irq_init in
machine declarations - the kernel initialization code calls irqchip_init()
when init_irq callback is missing in the machine descriptor. This way
there is no need to create a match table of irq controllers and call
their initialization functions in the board file.

Change-Id: I96c3d955b2b2bbd2fc6266b19d21390e166cb0ff
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>