INT 10 - Chips & Technologies Extended BIOS - TURN FLAT PANEL ON/OFF

	AX = 5F54h
	BL = new state
	    00h on
	    01h off
Return: AL = 5Fh if function supported
	    AH = status
		00h unsuccessful
		01h successful
SeeAlso: AX=5F50h,AX=5F51h,AX=5F53h,AX=5F5Ah