ARM: dts: msm: Change mpm gpio interrupt controller parent for msm8937

Change the interrupt-parent from tlmm to intc for the mpm gpio
interrupt controller and put the mpm gpio as interrupt parent
for tlmm. Client drivers has the tlmm as interrupt parent so,
interrupts are routed to tlmm first then mpm gpio and then intc.

Change-Id: I1877498e55cc0cb867a0e3aa24861dcc14e4a042
Signed-off-by: Raghavendra Kakarla <rkakarla@codeaurora.org>