msm: cpp: Return error values in cpp_init_hardware

Zero(no error) is returned from cpp_init_hardware funtion during
certain error condition. Fix is to return error value during error
conditions.

Change-Id: Ifd302e5cfdddd54b3cf074c42bf70dbcb6306119
Signed-off-by: Krishnankutty Kolathappilly <kkolat@codeaurora.org>