soc: qcom: bgcom: checks rsb status before sending subsequent commands

Checks the RSB status before sending any enable/disable/calibration
or button configuration command to BG. Before sending these commands,
RSB should be configured properly.

Change-Id: I521c545d850e82fae8a56a3347dba4b68a0b060a
Signed-off-by: Arjun Singh <arsingh@codeaurora.org>