Initial commit: CB-C6s-STU GSI Fixes

TWRP flashable zip for CB-C6s-STU tablet running GSI.
- build.prop: append tablet characteristics, brightness, orientation, BT offload
- goodix_ts.idc: touchscreen IDC config
- sensor_config.xml: camera sensor module mapping (hi846 / gc8034)
- Shell-script update-binary with append-only build.prop logic

system/build.prop

@@ -0,0 +1,12 @@
+# Tablet characteristics
+ro.build.characteristics=tablet
+
+# Workaround: Set the max_brightness of sprd_backlight to 1023
+persist.sys.qcom-brightness=1023
+
+# Workaround: Set the primary display orientation to landscape
+ro.surface_flinger.primary_display_orientation=ORIENTATION_90
+
+# Workaround: Disable bluetooth A2DP offload
+ro.bluetooth.a2dp_offload.supported=false
+persist.bluetooth.a2dp_offload.disabled=true