Dialer: Remove compatibility (1/x)

* Now that we don't expect any more changes we can rip out
  all the unused stuff
* Start with all the TargetApi-checks for N, O and P including
  version checks in code for those and remove the old number
  blocking - we have the provider since 2017 now...

Change-Id: Ib9369476fa660c44d946b0e41b0d23a34ff14e7c
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 6243740..8b4086c 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -20,7 +20,7 @@
   android:versionName="23.0">
 
   <uses-sdk
-    android:minSdkVersion="24"
+    android:minSdkVersion="27"
     android:targetSdkVersion="30"/>