msm: gic: Remove manual GIC programming for PPI trigger type

There is no need to manually program GIC for edge trigger PPIs
through board or device file hooks after the introduction of
enable_percpu_irq(.., type) interface. 2nd parameter of this
API needs to be used for programming the right trigger type for the PPI.

Change-Id: I2f33672f565dc94413365fd95f9f92aa07318687
Signed-off-by: Trilok Soni <tsoni@codeaurora.org>