package/mpv: bump to version 0.32.0

package/mpv: bump to version 0.32.0

- Use github helper
- Drop first patch (not needed since version 0.30.0 and
  https://github.com/mpv-player/mpv/commit/9fd90c549c4022d7f9283adc1a97a076614c1458)
- vapoursynth-lazy has been dropped since version 0.30.0 and
  https://github.com/mpv-player/mpv/commit/fb8d240c4d045ca254aa6693c48aecc75954cba0
- mali-fbdev has been dropped since version 0.30.0 and
  https://github.com/mpv-player/mpv/commit/83d7123dc32e7fb8b1e05ed21af845707d115295
- libdvread has been dropped since version 0.30.0 and
  https://github.com/mpv-player/mpv/commit/62294049852549e99ec948e0df16452856afa0c1
- libv4l2 has been dropped since version 0.30. and
  https://github.com/mpv-player/mpv/commit/b30e85508a305d668db8419556d295a65ab08707
- Update indentation in hash file (two spaces)

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>