wlan:Check priviledge permission before processing SET_PACKET_FILTER IOCTL

Kernel assumes all SET IOCTL commands are assigned with even
numbers. But in our WLAN driver, some SET IOCTLS are assigned with
odd numbers. This leads kernel fail to check, for some SET IOCTLs,
whether user has the right permission to do SET operation.
Hence, in driver, before processing SET_PACKET_FILTER IOCTL, making
sure user task has right permission to process the command.

CRs-Fixed: 930937
Git-commit: 88ce639e7a0bba852f193b6f53b7ca1926a09b02
Bug: 25344453
Signed-off-by: Amarnath Hullur Subramanyam <amarnath@codeaurora.org>