Add support One-handed mode in B3

Add support One-handed mode system properties flag to enable B3
project.

Bug: 200899897

Test: Build a new ROM build to manually test
Change-Id: Ia511f9a298f76589780f258daf657d36c666e206
diff --git a/device.mk b/device.mk
index 3f288ce..c035763 100644
--- a/device.mk
+++ b/device.mk
@@ -824,6 +824,10 @@
 PRODUCT_PRODUCT_PROPERTIES += \
 	ro.postinstall.fstab.prefix=/product
 
+# Set support one-handed mode
+PRODUCT_PRODUCT_PROPERTIES += \
+    ro.support_one_handed_mode=true
+
 PRODUCT_COPY_FILES += \
 	device/google/gs101/conf/fstab.postinstall:$(TARGET_COPY_OUT_PRODUCT)/etc/fstab.postinstall