Revert "libstagefright: Re-introduce a QCOM_HARDWARE ifdef after the FFMPEG commit"

This reverts commit 90044a90c66510274794ce6c3b7ad55f817b0165.
Revert "libstagefright: Extended media support via FFMPEG"

This reverts commit 3113d5d9c90adde859d62a48832fb3ca1d30b1a8.