ASoC: amd: renaming pcm substream names and bytescount params

With in ACP, There are three I2S controllers can be configured.
(I2S SP ,I2S MICSP and I2S BT).These controllers can
support both playback/capture scenarios.
Default enabled i2s controller instance is i2s sp instance.

Renamed stream names and bytescount params as i2ssp.
These changes required to distinguish with other I2S controller
instance pcm substreams and bytescount params.

Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mark Brown <broonie@kernel.org>