msm_serial_hs_lite: Refactor wait_for_xmitr

Remove the second argument to wait_for_xmitr in preparation
for further refactoring of the console code, and because
all call sites wait for the same status bit.

Change-Id: I1688e2bc5048439a98dda7550b43ceaaaa84d437
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>