build: Define targets bases for vm types

This creates a list of targets that are applicable for
vm types.

Change-Id: I72f3446a31ac135fe57d4e949ce854b0ecbfe7e1
Signed-off-by: Abdul Salam <quic_asalam@quicinc.com>

target_variants.bzl

@@ -25,7 +25,12 @@ vm_types = [
     "oemvm",
 ]
 
-vm_targets = ["{}-{}".format(t, vt) for t in targets for vt in vm_types]
+vm_target_bases = [
+    "kalama",
+    "pineapple",
+]
+
+vm_targets = ["{}-{}".format(t, vt) for t in vm_target_bases for vt in vm_types]
 
 vm_variants = [
     # keep sorted