qcacmn: Access initial ipa tx doorbell after enable pipes

Currently host writes to TX doorbell register after ipa connect
pipes to indicate number of free TX buffers. In case when IPA
clocks are off and host tries to access the register will leads
to invalid access. So access the tx doorbell register after ipa
enable pipes which makes sure IPA clocks are always on.

Change-Id: If11fdc9c408ebf7f22eef6a020b507bc39ee6a8e
CRs-Fixed: 2599029
2 files changed