mt8195: Disable GOOGLE AEC MOCK by default

The mocking layer is an important debugging tool.  It shouldn't be on
by default lest we accidentally build without the real feature.

Signed-off-by: Andy Ross <andyross@google.com>

src/arch/xtensa/configs/override/mt8195_chrome_google_rtc_rtnr.config

@@ -1,4 +1,3 @@
 CONFIG_COMP_RTNR=y
 CONFIG_COMP_GOOGLE_RTC_AUDIO_PROCESSING=y
-CONFIG_GOOGLE_RTC_AUDIO_PROCESSING_MOCK=y
 CONFIG_COMP_MUX=y