[LSC] Add LOCAL_LICENSE_KINDS to external/piex

Added SPDX-license-identifier-Apache-2.0 to:
  Android.bp

Bug: 68860345
Bug: 151177513
Bug: 151953481

Test: m all

Exempt-From-Owner-Approval: janitorial work
Change-Id: Idb404d88f2f74aa2c84877417f5414ae08d6502f

Android.bp

@@ -1,3 +1,20 @@
+package {
+    default_applicable_licenses: ["external_piex_license"],
+}
+
+// Added automatically by a large-scale-change
+// See: http://go/android-license-faq
+license {
+    name: "external_piex_license",
+    visibility: [":__subpackages__"],
+    license_kinds: [
+        "SPDX-license-identifier-Apache-2.0",
+    ],
+    license_text: [
+        "LICENSE",
+    ],
+}
+
 cc_defaults {
     name: "piex_default_cflags",
     cflags: ["-Wall", "-Werror", "-Wsign-compare"],