drm/i915/crc: implement get_crc_sources callback
This patch implements get_crc_sources callback, which returns list of all the valid crc sources supported by driver in current platform. Changes since V1: - Return array of crc sources Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com> Cc: dri-devel@lists.freedesktop.org Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180713135942.25061-8-mahesh1.kumar@intel.com
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