spca561 webcam support, broken since v4.18

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v4.17.19 is the last version it works with. Since v4.18 I cannot use it.

from the lsusb output:

ID 04fc:0561 Sunplus Technology Co., Ltd Flexcam 100

from the dmesg output:

After a restart, after I click to make it start capturing (the bandwidth
message appears only when the first capturing is started):

spca561 : alt 7 - bandwidth not wide enough, trying again
spca561 : frame overflow 19793 > 19200
spca561 : frame overflow 19793 > 19200
spca561 : frame overflow 19793 > 19200
spca561 : frame overflow 19793 > 19200
spca561 : frame overflow 19793 > 19200
spca561 : frame overflow 19793 > 19200
spca561 : frame overflow 19793 > 19200
spca561 : frame overflow 19793 > 19200
spca561 : frame overflow 19793 > 19200
spca561 : frame overflow 19793 > 19200
spca561 : frame overflow 19793 > 19200
spca561 : frame overflow 19793 > 19200
spca561 : frame overflow 19793 > 19200
spca561 : frame overflow 19793 > 19200
spca561 : frame overflow 19793 > 19200
spca561 : frame overflow 19793 > 19200

After clicking to make it stop capturing:

spca561 : urb status: -2
gspca_main: usb_submit_urb() ret -1
spca561 : urb status: -2
gspca_main: usb_submit_urb() ret -1
spca561 : urb status: -2
gspca_main: usb_submit_urb() ret -1




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