sm8350-common: Always use lahaina vendor media configs

AOSP loads media_codecs_lahaina by default and CAF will
fallback to media_codecs_lahaina if the lahaina_vendor
variant does not exist.
The vendor variant works on AOSP too, so no need to
duplicate this.

Change-Id: I6583c900c22bf277075393ddf49d95a687a6771a