usb: host: class: improve host video class.

1. Delete uvc_guid_map and related functions, use the
database and helper functions from usb_common_uvc.c
2. Rename uvc_host_parse_frame_intervals as
uvc_host_parse_frame_default_intervals to select
default frame interval.
3. Correct uvc_host_select_streaming_alternate to do
right alternate selection.
4. Implement uvc_host_removed function.
5. Enhance the video_usb_uvc_host_set_stream function.

Signed-off-by: Aiden Hu <[email protected]>

Author: AidenHu