[RAMEN9610-14114] [9610] wlbt: fix completion when ignoring SABLE request in wlbtd

[RAMEN9610-14114] [9610] wlbt: fix completion when ignoring SABLE request in wlbtd

When we get rapid requests for SABLE generation, to serialise while processing current request,
we ignore requests other than "fw_panic" in wlbtd and send a msg "ignoring" back to kernel.
We must complete in this case as well.

We must complete one completion upon message from wlbtdi, which has
waiter(s). completion_done() API does the check without modifying
the completion in anyway and returns false if there are waiters and
true otherwise

SCSC-Bug-Id: ssb-51156
Change-Id: Ieabcd8377a3040bdcfe51e4310eb55d84c693446
Signed-off-by: Purnendu Kapadia <p.kapadia@samsung.com>