message: Make "failed to query DMA-BUF modifiers" just warning message
  It's not a problem if we fail to query DMA-BUF modifiers as we can still
  continue with modifier-less buffers.
  Cr-Commit-Position: refs/heads/main@{#37342}
diff: @@ -635,7 +635,7 @@ std::vector<uint64_t> EglDmaBuf::QueryDmaBufModifiers(uint32_t format) {
  EglQueryDmaBufFormatsEXT(egl_.display, 0, nullptr, &count);
  if (!success || !count) {
  - RTC_LOG(LS_ERROR) << "Failed to query DMA-BUF formats.";
  + RTC_LOG(LS_WARNING) << "Cannot query the number of formats.";
  return {DRM_FORMAT_MOD_INVALID};
  }
  @@ -643,12 +643,12 @@ std::vector<uint64_t> EglDmaBuf::QueryDmaBufModifiers(uint32_t format) {
  if (!EglQueryDmaBufFormatsEXT(egl_.display, count,
  reinterpret_cast<EGLint*>(formats.data()),
  &count)) {
  - RTC_LOG(LS_ERROR) << "Failed to query DMA-BUF formats.";
  + RTC_LOG(LS_WARNING) << "Cannot query a list of formats.";
  return {DRM_FORMAT_MOD_INVALID};
  }
  if (std::find(formats.begin(), formats.end(), drm_format) == formats.end()) {
  - RTC_LOG(LS_ERROR) << "Format " << drm_format
  + RTC_LOG(LS_WARNING) << "Format " << drm_format
  << " not supported for modifiers.";
  return {DRM_FORMAT_MOD_INVALID};
  }
  @@ -657,14 +657,14 @@ std::vector<uint64_t> EglDmaBuf::QueryDmaBufModifiers(uint32_t format) {
  nullptr, &count);
  if (!success || !count) {
  - RTC_LOG(LS_ERROR) << "Failed to query DMA-BUF modifiers.";
  + RTC_LOG(LS_WARNING) << "Cannot query the number of modifiers.";
  return {DRM_FORMAT_MOD_INVALID};
  }
  std::vector<uint64_t> modifiers(count);
  if (!EglQueryDmaBufModifiersEXT(egl_.display, drm_format, count,
  modifiers.data(), nullptr, &count)) {
  - RTC_LOG(LS_ERROR) << "Failed to query DMA-BUF modifiers.";
  + RTC_LOG(LS_WARNING) << "Cannot query a list of modifiers.";
  }
  // Support modifier-less buffers
  