msm: ipa: Fix to polling mode

When IPA clock is enabled, suspend bit is cleared
and if pipe is non-empty EOT is posted internally.
At the same time, there is a possibility that SPS
driver posts EOT. This can result into incorrect
state of polling state and switch to intr mode is
tried repeatedly. Make a change to check if we are
in intr mode already in addition to the polling state.

Change-Id: I1af08605f7d2d234b0e5a4e3c8928db6cff5c7b4
Acked-by: Chaitanya Pratapa <cpratapa@qti.qualcomm.com>
Signed-off-by: Sridhar Ancha <sancha@codeaurora.org>