Update aml_pcm.c

Bitwise error in SNDRV_PCM_FORMAT_S24_LE format manipulation. It is 24bits right-aligned in 32bits words.
Update aml_pcm.c

Not assuming devices < MESON6 can playback 192khz. Clocking code specific to MESON6 tends to prove they cannot.
Merge pull request #1 from gdedrouas/master

S24_LE format fix in aml soc sound driver