haptics: Update output distortion gain

Recommended output distortion gain is 0.29.

Bug: 328799172
Test: getprop | grep hapticgenerator
Flag: EXEMPT bugfix
Change-Id: I784c7933e63fce0dfe84ab76400e913e5b0567e1

device-lynx.mk

@@ -170,6 +170,10 @@ PRODUCT_VENDOR_PROPERTIES += \
 	persist.vendor.vibrator.hal.context.cooldowntime=1600 \
 	persist.vendor.vibrator.hal.context.settlingtime=5000
 
+# Override Output Distortion Gain
+PRODUCT_VENDOR_PROPERTIES += \
+    vendor.audio.hapticgenerator.distortion.output.gain=0.29
+
 # Trusty liboemcrypto.so
 PRODUCT_SOONG_NAMESPACES += vendor/google_devices/lynx/prebuilts