qcacld-3.0: Do not get global context in hdd_svc_fw_shutdown_ind()
Currently hdd_svc_fw_shutdown_ind() calls cds_get_global_context() to
get the global context. At one time this was necessary since the
global context was required to get the module-specific context.
However the global context is no longer required, so remove the
unnecessary retrieval of the global context.
Change-Id: Ic61370c7d27860b0c6d51c8a610dc770c7c50b0a
CRs-Fixed: 2103618