ASoC: phycore-ac97: Remove unused driver

Since commit e1324ece ("ARM: imx: Remove i.MX35 board files"), the
MACH_PCM043 and MACH_PCA100 non-DT platform are no longer supported,
so get rid of their machine audio driver too.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/20201110203937.25684-3-festevam@gmail.com


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