Bluetooth: Classic: HFP_HF: Correct definition of supported features

In current implementation, there are two issues found,

Issue 1, the feature defined in the SDP HFP HF record are used in
combination as HFP HF supported features reported via `+BRSF`.

Issue 2, the macro `BT_HFP_HF_FEATURE_CODEC_NEG_ENABLE` is not
aligned with macro name of other features. The other macros are named
with prefix `BT_HFP_HF_FEATURE_`.

Use `BT_HFP_HF_FEATURE_VOLUME_ENABLE` to set the volume feature
instead of `BT_HFP_HF_SDP_FEATURE_VOLUME_ENABLE`.

Rename `BT_HFP_HF_CODEC_NEG_ENABLE` with new name
`BT_HFP_HF_FEATURE_CODEC_NEG_ENABLE`.

Signed-off-by: Lyle Zhu <lyle.zhu@nxp.com>