hardware/qcom/media: Fix for AACEncoder CTS test failure on 7x27A

- AACEncoders CTS test fail in CTS verification.
- AAC hardware encoder is not supported due to this
  getting failed in CTS verification.
- Remove hardware AAC encoder from registry table.

Change-Id: Ie2c552308fe32c78b1cc03f454a18d015c518c34
CRs-Fixed: 457174