ARM: dts: msm: Update GIC/ERP interrupt polarity for SHIMA

Correct the interrupt polarity for GIC/ERP. Here, we are changing
interrupt polarity for GIC to adhere with other target.

And correcting the ERP interrupt polarity to HIGH as making it low
causing a below warning while bootup.

irq: type mismatch, failed to map hwirq-16 for
interrupt-controller@17a00000!.

Change-Id: I818b264c7d61cdf8f8b0f20984dfadfb781a4301