usb: host: ehci: remove unnecessary max_packet() macro

Now that usb_endpoint_maxp() only returns the lowest
11 bits from wMaxPacketSize, we can remove this macro
from the driver.

Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: <linux-usb@vger.kernel.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/host/ehci-sched.c

@@ -1068,7 +1068,6 @@ iso_stream_init(
 
 		stream->highspeed = 1;
 
-		maxp = max_packet(maxp);
 		buf1 |= maxp;
 		maxp *= multi;