FROMLIST: ASoC: qcom: Kconfig: Tweak dependencies on SND_SOC_SDM845

CROS_EC isn't strictly required for audio to work
on other SDM845 platforms (like the Dragonboard 845c).

So lets remove the dependency and select the related
CROS_EC options via imply.

Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: Rohit kumar <rohitkr@codeaurora.org>
Cc: Patrick Lai <plai@codeaurora.org>
Cc: Banajit Goswami <bgoswami@codeaurora.org>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: alsa-devel@alsa-project.org
Signed-off-by: John Stultz <john.stultz@linaro.org>
Link: https://lore.kernel.org/lkml/20200619031407.116140-1-john.stultz@linaro.org/T/#u
Change-Id: I5cd72289e42f4f0110d5f53a4166691b1cd9afeb