media: qcom: venus: add power domain enable logic for Venus cores

media: qcom: venus: add power domain enable logic for Venus cores

Attach power domains for vdec and venc cores and power them up if a vdec
or venc session is started.

Vcodec clocks are added and enabled to the core Venus device both for
vcodec0 and vcodec1. To ensure they are added only once, introduce a new
property "vcodec_clks", which is an array of clocks which are enabled
both during decode and encode and is retrieved from the device tree only
once.

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Erikas Bitovtas <xerikasxx@gmail.com>
Signed-off-by: Bryan O'Donoghue <bod@kernel.org>