Add control definitions and documentation for controls specific to codec devices. Signed-off-by: Kamil Debski <k.debski@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com> Change-Id: I94e1be196120988cfee2420ba6bd342eece1f481 Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>