media: meson: vdec: add common HEVC decoder support

Add support for the HEVC & VP9 common decoder support, handling
Amlogic GXBB, GXL, G12A and SM1 platforms.

This handles the "HEVC" hw decoder used for HEVC and VP9, and will be
using in the new H264 multi-instance decoder for G12A & SM1 platforms.

Signed-off-by: Maxime Jourdan <mjourdan@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>