soc: qcom: glink: Refactor rwref lock mechanism

Add an option to rwref locks that allow the lock functions
to spin when acquiring the lock. Change completion variable
to use waitqueues for sleep functionality.

Change rwref reference function calls to use locking functions
where code reads or writes the context state.

CRs-Fixed: 988266
Change-Id: Ib2908b2495b1b01a6a130033143a7da8e5c0c231
Signed-off-by: Chris Lew <clew@codeaurora.org>