VmTerminalApp: Merge with LinuxInstaller

This CL includes following changes:
- Move linux_vm_setup
- Move LinuxInstaller's MainActivity as InstallerActivity
  - InstallerActivity finishes self when done
- Remove LinuxInstaller and clean up relevant codes

Bug: 369746567
Test: manually
Change-Id: I2c97e07b00e110aebe09db2760b26257ace4f7d9
diff --git a/build/apex/Android.bp b/build/apex/Android.bp
index f794239..4b69660 100644
--- a/build/apex/Android.bp
+++ b/build/apex/Android.bp
@@ -175,6 +175,10 @@
         "true": ["virtualizationservice.xml"],
         default: unset,
     }),
+    required: select(release_flag("RELEASE_AVF_SUPPORT_CUSTOM_VM_WITH_PARAVIRTUALIZED_DEVICES"), {
+        true: ["linux_vm_setup"],
+        default: [],
+    }),
 }
 
 apex_defaults {