add support for raspberry pi 4 v4l2 video encoder #2084

Job	Run time
Build (aarch64-linux-android)	5m 34s
Build (x86_64-unknown-linux-gnu)	6m 48s
Build (x86_64-pc-windows-msvc)	8m 42s
Build (x86_64-linux-android)	5m 17s
Build (aarch64-pc-windows-msvc)	8m 55s
Build (aarch64-apple-darwin)	15m 2s
Build (aarch64-unknown-linux-gnu)	2m 27s
Build (armv7-linux-androideabi)	5m 38s
Build (aarch64-apple-ios)	7m 10s
Build (aarch64-apple-ios-sim)	5m 44s
Build (x86_64-apple-darwin)	6m 30s
	1h 17m 47s

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