Remove unused property persist.demo.hdmirotationlock am: 6605954e44

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/qcom/sm7250/display/+/14320561

Change-Id: I2a31c878a1882b9cd6b7287ce6ee6150979b7df8
diff --git a/config/display-product.mk b/config/display-product.mk
index 3c30714..2922b97 100644
--- a/config/display-product.mk
+++ b/config/display-product.mk
@@ -20,7 +20,6 @@
     modetest
 
 PRODUCT_PROPERTY_OVERRIDES += \
-    persist.demo.hdmirotationlock=false \
     persist.sys.sf.color_saturation=1.0 \
     persist.sys.sf.color_mode=9 \
     debug.sf.hw=0 \