msm: 8974: use correct interrupt numbers

Correct the interrupt number for the PMU interrupt in 8974.
Remove the entries for two other obsolete interrupts which
would appear to clash with the PMU interrupt. These interrupt
definitions are not used anywhere else in the kernel.

Change-Id: Iafb26e0a2aaab413a888f02bd770e18684a95295
Signed-off-by: Neil Leeder <nleeder@codeaurora.org>