C2SoftDav1dDec: Move libyuv calls to SimpleC2Component

libyuv calls are now moved to functions in SimpleC2Component, so that
they can be called from other plugins as well in the future.

Also, with this libcodec2_soft_av1dec_dav1d.so doesn't depend on libyuv
directly and instead libcodec2_soft_common.so depends on libyuv.

This helps in handling cfi related failures that are seen when some
*.so declared cfi_assembly_support as true and some didn't and had a
depedency on libyuv.

Bug: 286058440
Bug: 286564165

Test: stagefright -s av1.webm
Merged-In: I230227149cffe45a8cc47fe1095685af1e95fc34
Change-Id: I230227149cffe45a8cc47fe1095685af1e95fc34