ARM: dts: msm: add IPA virtual mode for msmzirc

Add parameter to msmzirc-rumi dtsi for IPA virtual mode.
This parameter is used by IPA driver to do platform
specific operations such as register wake interrupts.

Change-Id: Id0c3b9427658ad8c8c988fdd85c07c5bdfdae1a3
Acked-by: Ady Abraham <adya@qti.qualcomm.com>
Signed-off-by: Ravit Katzav <rkatzav@codeaurora.org>