Move launcher to under guest

Bug: 352458998
Test: pass TH
Change-Id: If7803053854e35bf993e13890fe24271e6b08bdf
diff --git a/launcher/Android.bp b/guest/microdroid_launcher/Android.bp
similarity index 100%
rename from launcher/Android.bp
rename to guest/microdroid_launcher/Android.bp
diff --git a/launcher/main.cpp b/guest/microdroid_launcher/main.cpp
similarity index 100%
rename from launcher/main.cpp
rename to guest/microdroid_launcher/main.cpp