cc bp2build for sysprop_library modules

This CL implements bp2build functionality for the cc outputs of
sysprop_library modules. cc_* modules depending on sysprop sources
will be handled in a later CL.

Bug: 244439349
Test: b build //system/libsysprop/srcs/...
Test: Inspect BUILD.bazel
Test: Unit tests
Change-Id: I6fa20661b984223347480c9afe0885b5db5a2807
diff --git a/sysprop/Android.bp b/sysprop/Android.bp
index 1d5eb31..e5263fe 100644
--- a/sysprop/Android.bp
+++ b/sysprop/Android.bp
@@ -9,6 +9,7 @@
         "blueprint",
         "soong",
         "soong-android",
+        "soong-bp2build",
         "soong-cc",
         "soong-java",
     ],
@@ -18,6 +19,7 @@
     ],
     testSrcs: [
         "sysprop_test.go",
+        "sysprop_library_conversion_test.go",
     ],
     pluginFor: ["soong_build"],
 }