Revert "Replace libI420colorconvert with libc2dcolorconvert"

This reverts commit 636bc6b9e57ba9d953858b136a3b527a3c0bdf52.

Conflicts:
	libc2dcolorconvert/Android.mk
Revert "Fix build with new C2D color converter"

This reverts commit 62d88d9312cd2ef7b05643bd4a1c2294c34723c6.
Revert "vidc: Use O_SYNC for pmem device."

This reverts commit a3e381d5713bdd8fb8884c181bbfc4a7448cb0a0.
Revert "mm-core: Add kKeySmoothStreaming"

This reverts commit 9d4b717a3972448ee6c675bdaf33dd0292b235d9.

Conflicts:
	mm-core/inc/QCMetaData.h
Revert "mm-core: Add key for HFR encoding"

This reverts commit a983eede4af380321c411d3cf1b95c7c446113b1.

Conflicts:
	mm-core/inc/QCMetaData.h
Revert "mm-video: Use actual kernel headers for all builds"

This reverts commit 2ab282b22d58f9cacc8fad1daba321b5d0c9fd01.