Encoder: add AVC encoder pipeline support on KBL
Encoder: add AVC encoder pipeline support on KBL

Fixes #73

Signed-off-by: Pengfei Qu <3770d20c463a9a2048391f18839a717424bdb1b3@intel.com>
(cherry picked from commit e9a0038f780bd4822ad472b1059ff1bee2fcd0be)

01org/iotg-lin-gfx-va-driver,01org/iotg-lin-gfx-va-driver,01org/iotg-lin-gfx-va-driver,01org/iotg-lin-gfx-va-driver,01org/iotg-lin-gfx-va-driver