drivers/misc/hdcp: add error handling for failed app initialization

Add error handling code for use cases in which HDCP app initialization
fails and the QSEECOM handle is invalid. This ensures that the HDCP
QSEECOM library can handle these scenarios gracefully.

Change-Id: I6147e01c062848f588019c40b7a3fee6cbfabf19
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>