msm: board-dt: Convert to use 0 preallocated interrupts

Since all interrupt chip drivers on the platform allocate their
descriptors at runtime, let's specify to not preallocate
anything.

Change-Id: I506ba0e07ec1e2daecd95d239586154e45f19917
Signed-off-by: Michael Bohan <mbohan@codeaurora.org>