v4l2videodec: Do not expose profiles/levels in vp8/vp9 template caps

Vp8/vp9 supported profiles/levels are listed in decoder sink caps, but
there is no parser for these two formats and the demuxers also don't have
these information. It causes negotiation fail between demuxers and decoder
when check caps "accept = gst_caps_is_subset (caps, template_caps);".
To fix this, need to remove profiles/levels for vp8/vp9 formats in decoder
sink caps.

Fix #854

Part-of: <gstreamer/gst-plugins-good!890>
31 jobs for !890 with backport-mr-887-into-1.18-v4l2vp8dec in 25 minutes and 16 seconds (queued for 3 seconds)
detached
Status Job ID Name Coverage
  Build Docker
passed #7721747
alpine amd64 manifest builder docker

00:00:23

passed #7721746
android docker

00:00:24

passed #7721745
cerbero fedora amd64 docker

00:00:23

passed #7721744
fedora amd64 docker

00:00:23

passed #7721748
gst-indent amd64 docker

00:00:23

 
  Preparation
passed #7721750
gst indent

00:00:10

passed #7721749
manifest

00:00:21

 
  Build
passed #7721759
gstreamer
build cerbero cross-android universal

00:13:49

passed #7721763
gst-ios-14.3
build cerbero cross-ios universal

00:20:17

passed #7721760
gstreamer
build cerbero cross win32

00:05:56

passed #7721761
gstreamer
build cerbero cross win64

00:08:03

passed #7721758
gstreamer
build cerbero fedora x86_64

00:06:00

passed #7721762
gst-macos-11.1
build cerbero macos x86_64

00:12:09

passed #7721754
build clang fedora x86_64

00:07:57

manual #7721757
docker windows 1809 allowed to fail manual
build msys2
passed #7721751
build nodebug fedora x86_64

00:04:28

passed #7721752
build static fedora x86_64

00:06:56

passed #7721753
build static nodebug fedora x86_64

00:04:49

passed #7721755
docker windows 1809
build vs2017 amd64

00:11:07

passed #7721756
docker windows 1809
build vs2017 x86

00:11:18

 
  Test
passed #7721764
gstreamer
check fedora

00:09:58

passed #7721765
gstreamer
integration testsuites fedora 1/4

00:14:26

passed #7721766
gstreamer
integration testsuites fedora 2/4

00:18:15

passed #7721767
gstreamer
integration testsuites fedora 3/4

00:17:08

passed #7721768
gstreamer
integration testsuites fedora 4/4

00:15:09

passed #7721770
gstreamer
valgrind bad

00:05:37

passed #7721771
gstreamer
valgrind ges

00:06:56

passed #7721769
gstreamer
valgrind good

00:09:23

 
  Integrate
passed #7721772
cross-android universal examples

00:08:49

passed #7721774
gst-ios-14.3
cross-ios universal examples

00:04:09

passed #7721773
documentation

00:12:00