ARM: dts: msm: Update the IRQ line of BAM DMUX for msm8937

Update the BAM DMUX devevice node to use the new IRQ line
for the RX data from A2.

Change-Id: I7174da1dc6a1473483efdcf1db5e1e204f25b48f
Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>