Rename .java to .kt (viewmodel files)

This is an intermediate commit created by AndroidStudio while converting
java to kotlin, for preserving git history. Due to this CL, the next CL will show the
changes from Java to Kotlin code side by side.

Bug: 182205982
Test: None. File is renamed

Change-Id: Ife93b40880a3d7a9869704331ef7167baaff315d
diff --git a/packages/PackageInstaller/src/com/android/packageinstaller/v2/viewmodel/InstallViewModel.java b/packages/PackageInstaller/src/com/android/packageinstaller/v2/viewmodel/InstallViewModel.kt
similarity index 100%
rename from packages/PackageInstaller/src/com/android/packageinstaller/v2/viewmodel/InstallViewModel.java
rename to packages/PackageInstaller/src/com/android/packageinstaller/v2/viewmodel/InstallViewModel.kt
diff --git a/packages/PackageInstaller/src/com/android/packageinstaller/v2/viewmodel/InstallViewModelFactory.java b/packages/PackageInstaller/src/com/android/packageinstaller/v2/viewmodel/InstallViewModelFactory.kt
similarity index 100%
rename from packages/PackageInstaller/src/com/android/packageinstaller/v2/viewmodel/InstallViewModelFactory.java
rename to packages/PackageInstaller/src/com/android/packageinstaller/v2/viewmodel/InstallViewModelFactory.kt
diff --git a/packages/PackageInstaller/src/com/android/packageinstaller/v2/viewmodel/UninstallViewModel.java b/packages/PackageInstaller/src/com/android/packageinstaller/v2/viewmodel/UninstallViewModel.kt
similarity index 100%
rename from packages/PackageInstaller/src/com/android/packageinstaller/v2/viewmodel/UninstallViewModel.java
rename to packages/PackageInstaller/src/com/android/packageinstaller/v2/viewmodel/UninstallViewModel.kt
diff --git a/packages/PackageInstaller/src/com/android/packageinstaller/v2/viewmodel/UninstallViewModelFactory.java b/packages/PackageInstaller/src/com/android/packageinstaller/v2/viewmodel/UninstallViewModelFactory.kt
similarity index 100%
rename from packages/PackageInstaller/src/com/android/packageinstaller/v2/viewmodel/UninstallViewModelFactory.java
rename to packages/PackageInstaller/src/com/android/packageinstaller/v2/viewmodel/UninstallViewModelFactory.kt