ASoC: cirrus: edb93xx: Delete driver

Can be replaced with "simple-audio-card" for the rates up to 50kHz, refer
to commit "ARM: dts: ep93xx: Add EDB9302 DT".

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>
Acked-by: Mark Brown <broonie@kernel.org>
Acked-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>