Emulate writes to the IA32_MISC_ENABLE MSR.

PR:		196093
Reported by:	db
Tested by:	db
Discussed with:	grehan
MFC after:	1 week
Remove some hard-coded IE assembly over to use net80211 methods.

PR:		kern/196069
Submitted by:	 Andriy Voskoboinyk <s3erios@gmail.com>