mb/google/brya: Add variants overridetree.cb path and remove unused registers

Add variants overridetree.cb path remove unused registers

BUG=b:174266035
TEST=Build Test

Signed-off-by: Eric Lai <ericr_lai@compal.corp-partner.google.com>
Change-Id: I2940332044aa4c2de6d58f5d0d2a2a7c1b2c3478
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49920
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
diff --git a/src/mainboard/google/brya/Kconfig b/src/mainboard/google/brya/Kconfig
index d210b4d..b691cd1 100644
--- a/src/mainboard/google/brya/Kconfig
+++ b/src/mainboard/google/brya/Kconfig
@@ -32,6 +32,10 @@
 	string
 	default "variants/baseboard/devicetree.cb"
 
+config OVERRIDE_DEVICETREE
+	string
+	default "variants/\$(CONFIG_VARIANT_DIR)/overridetree.cb"
+
 config MAINBOARD_DIR
 	string
 	default "google/brya"
diff --git a/src/mainboard/google/brya/variants/brya0/overridetree.cb b/src/mainboard/google/brya/variants/brya0/overridetree.cb
index 701a13f..df67048 100644
--- a/src/mainboard/google/brya/variants/brya0/overridetree.cb
+++ b/src/mainboard/google/brya/variants/brya0/overridetree.cb
@@ -5,17 +5,6 @@
 
 	register "SaGv" = "SaGv_Disabled"
 
-	# Acoustic settings
-	register "AcousticNoiseMitigation" = "1"
-	register "SlowSlewRate[VR_DOMAIN_IA]" = "SLEW_FAST_8"
-	register "SlowSlewRate[VR_DOMAIN_GT]" = "SLEW_FAST_8"
-	register "SlowSlewRate[VR_DOMAIN_SA]" = "SLEW_FAST_8"
-	register "SlowSlewRate[VR_DOMAIN_VLCC]" = "SLEW_FAST_8"
-	register "FastPkgCRampDisable[VR_DOMAIN_IA]" = "1"
-	register "FastPkgCRampDisable[VR_DOMAIN_GT]" = "1"
-	register "FastPkgCRampDisable[VR_DOMAIN_SA]" = "1"
-	register "FastPkgCRampDisable[VR_DOMAIN_VLCC]" = "1"
-
 	device domain 0 on
 		device ref cnvi_wifi on
 			chip drivers/wifi/generic