switch: qcom: initialize parb_phase to 0

If none of the "if" conditions are met, an uninitialized
parb_phase will be used. Initialize parb_phase so that it can
be handled properly.

Change-Id: I682ece7330cd257566ea740c4498bc786ae95588
Signed-off-by: Tony Truong <truong@codeaurora.org>