rockchip: add support for Radxa ROCK 3B #2411

Job	Run time
Build all core packages for selected target / Determine Changed Files / Determine Changed Files	9s
Build all core packages for selected target / Determine Changed Packages / Determine Changed Packages	8s
Build all core packages for selected target / Build Packages with external toolchain (x86, 64) / Set up build x86/64	6s
Build all core packages for selected target / Build Packages with external toolchain (malta, be) / Set up build malta/be	10s
Build all core packages for selected target / Build Packages with external toolchain (x86, 64) / Build x86/64	14m 39s
Build all core packages for selected target / Build Packages with external toolchain (x86, 64) / Check packages for x86/64	3m 22s
Build all core packages for selected target / Build Packages with external toolchain (malta, be) / Build malta/be	17m 24s
Build all core packages for selected target / Build Packages with external toolchain (malta, be) / Check packages for malta/be	3m 16s
Build all core packages for selected target / Upload ccache cache to s3	0s
	39m 14s

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