vmbase/pvmfw: Remove unnecessary 'stem' properties

The default extension of raw_binary is '.bin'. No need to specify in
the build rule.

Test: m pvmfw vmbase_example
Change-Id: I53f443d4d086411fe6f5f45066856d39333451b0
diff --git a/pvmfw/Android.bp b/pvmfw/Android.bp
index 4fcde74..51995ad 100644
--- a/pvmfw/Android.bp
+++ b/pvmfw/Android.bp
@@ -55,7 +55,6 @@
 raw_binary {
     name: "pvmfw",
     src: ":pvmfw_elf",
-    stem: "pvmfw.bin",
     enabled: false,
     target: {
         android_arm64: {
diff --git a/vmbase/example/Android.bp b/vmbase/example/Android.bp
index e9391b9..4011807 100644
--- a/vmbase/example/Android.bp
+++ b/vmbase/example/Android.bp
@@ -61,7 +61,6 @@
 raw_binary {
     name: "vmbase_example",
     src: ":vmbase_example_elf",
-    stem: "vmbase_example.bin",
     enabled: false,
     target: {
         android_arm64: {