prowl: add stub for is-secure-boot

In reference to b/32142214

Change-Id: I06ef42153ad45bb77aacbc9b5b4068bd5d948dac
diff --git a/cmds/is-secure-boot.gfch100 b/cmds/is-secure-boot.gfch100
new file mode 120000
index 0000000..cf37783
--- /dev/null
+++ b/cmds/is-secure-boot.gfch100
@@ -0,0 +1 @@
+is-secure-boot.stub
\ No newline at end of file
diff --git a/cmds/is-secure-boot.gfrg240 b/cmds/is-secure-boot.gfrg240
new file mode 120000
index 0000000..cf37783
--- /dev/null
+++ b/cmds/is-secure-boot.gfrg240
@@ -0,0 +1 @@
+is-secure-boot.stub
\ No newline at end of file
diff --git a/cmds/is-secure-boot.gfch100 b/cmds/is-secure-boot.stub
similarity index 100%
rename from cmds/is-secure-boot.gfch100
rename to cmds/is-secure-boot.stub