[HVR] Move shared functionality to "hvrcommon"

A number of classes and layouts are shared by the builds for HVR
and Vision Glass, for example the ones that use Huawei services
and provide phone-specific UI elements (e.g. legal terms).

These sources will be located in the "hvrcommon" folder so it is
easier to share them between both builds.

app/build.gradle

@@ -524,13 +524,15 @@ android {
 
         hvr {
             java.srcDirs = [
-                    'src/hvr/java'
+                    'src/hvr/java',
+                    'src/hvrcommon/java'
             ]
             assets.srcDirs = [
                     'src/hvr/assets'
             ]
             res.srcDirs = [
-                    'src/hvr/res'
+                    'src/hvr/res',
+                    'src/hvrcommon/res'
             ]
         }
 
@@ -555,7 +557,11 @@ android {
         visionglass {
             java.srcDirs = [
                     'src/visionglass/java',
-                    'src/hvr/java/com/igalia/wolvic/speech'
+                    'src/hvrcommon/java'
+            ]
+            res.srcDirs = [
+                    'src/visionglass/res',
+                    'src/hvrcommon/res'
             ]
         }