include/linux: add HDCP QSEECOM header file

Add the HDCP QSEECOM header file as it contains definitions used
in client drivers such as the DisplayPort driver.

This implementation is based on a snapshot of the HDCP QSEECOM
module as of this commit 86411ada84786796 ("drm/msm/hdcp: Update
HDCP QSEECOM to start auth on user command") on kernel-4.19.

Change-Id: I6481e189dcedace9a571ce06db079c63fab1ef01
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>