ASoC: rt1015p: add codec driver

Adds rt1015p codec driver.

Rt1015p is a rt1015 variant.
- It doesn't support I2C.
- It only supports S24, 48kHz, 64FS.

Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20200910042949.3795682-2-tzungbi@google.com


Signed-off-by: Mark Brown <broonie@kernel.org>