cnss_pci: fix the race condition in firmware file setup

Add protection code to avoid the redundant firmware
setup from the userspace. Synchronize firmware setup
global data access by multiple firmware setup routines
when firmware setup triggered by userspace is in progress.

CRs-Fixed: 2053638
Change-Id: Ib5bf05aade464a0789c7b848457e95d25c4e6f8f
Signed-off-by: Sarada Prasanna Garnayak <sgarna@codeaurora.org>