UPSTREAM: usb: dwc2: host: enable descriptor dma for fs devices

UPSTREAM: usb: dwc2: host: enable descriptor dma for fs devices

As descriptor dma mode does not support split transfers, it can't be
enabled for high speed devices. Add a core parameter to enable it for
full speed devices.

Ensure frame list and descriptor list are correctly freed during
disconnect.

Change-Id: I3793f7d00d5c791469daa1e4eb39bfff7a2a5c65
Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@intel.com>
Signed-off-by: Gregory Herrero <gregory.herrero@intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Huang, Tao <huangtao@rock-chips.com>
(cherry picked from commit fbb9e22b15ad3c9a98c66bad801b4d1366e8bf20)