qcacld-3.0: Use mac_handle_t in wlan_hdd_ioctl

Change "qcacld-3.0: Introduce mac_handle_t" introduced a modern
name for what was previously called the tHalHandle. Transition
wlan_hdd_ioctl to use the new naming.

Change-Id: I5b6a062e02dc6db387c0a4e4cc363cdac7013f45
CRs-Fixed: 2267221