Revert "Add "Touchscreen" app to properly setup touchscreen calibration"

This reverts commit 19f71681a460a1335c631fd2d096d90a42bfaa2b.

This is no longer needed since ro.sf.hwrotation has been merged in
frameworks/native based on
https://android-review.googlesource.com/c/platform/frameworks/native/+/671042
diff --git a/overlay.mk b/overlay.mk
index d802561..b50e519 100644
--- a/overlay.mk
+++ b/overlay.mk
@@ -20,8 +20,7 @@
 	treble-overlay-xiaomi-mimix2s \
 	treble-overlay-xiaomi-redmi6pro \
 	HardwareOverlayPicker \
-	QtiAudio \
-	Touchscreen
+	QtiAudio
 
 
 PRODUCT_PACKAGES += \