ASoC: msm: Fix incorrect argument checking in msm_ion_import

Remove argument checking added which incorrectly checked
for a NULL ionflag and a 0 bufsize. Both of those arguments
are fine to be NULL or 0. Previous addition of that check
casued all audio calibration to break and AIO utils as well.

Change-Id: I81bd9cf23e1c5e5dd71e5abbb14e8948227eac50
Signed-off-by: Ben Romberger <bromberg@codeaurora.org>