soc: qcom: bgcom: prevent BG status checking while SPI is busy

Stops any transaction which try to resume BG while SPI is held
by TZ.

Change-Id: I45c5d4dcc9ab094f63742d7ca3f82b12a2fdae4a
Signed-off-by: Arjun Singh <arsingh@codeaurora.org>
Signed-off-by: Ramesh Yadav Javadi <javadi@codeaurora.org>