Bring ICNSS family drivers from msm-5.10 kernel as of commit
'cb298739ee51 ("icnss2: Download bdf file for helium targets")'
to WLAN platform project.
Updated wlan_firmware_service files and makefiles to support
ICNSS2 compilation.
Change-Id: I02cf792b61772f07ac0607be7bb6b3bfda7815e4