char: msm_smd_pkt: Add POLLPRI support for signal update

Clients in user space need a notification mechanism when SMD channel
signals are modified by the remote side instead of calling IOCTL everytime.

Change in signal status are notified to client over POLL with POLLPRI mask.

CRs-Fixed: 2210083
Change-Id: I4b50b053a9af93b853cff46fb8d35c320e608aab
Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
1 file changed