bp2build java_libraries depend on Android SDK

Soong adds an implicit dependency on the Android SDK for all
java_libraries (and related modules). This feature becomes apparent
after converting arch-variant srcs for android_apps, so we should suport
this for now. Eventually, we will want to replace this forced dependency
with a Bazel toolchain workaround.

Test: build/bazel/ci/bp2build.sh
Change-Id: Ic28e8c7690f69294b4bdcb9bb78a6f1f031fe97e

bp2build/android_app_conversion_test.go

@@ -51,6 +51,7 @@ android_app {
 				"srcs":           `["app.java"]`,
 				"manifest":       `"AndroidManifest.xml"`,
 				"resource_files": `["res/res.png"]`,
+				"deps":           `["//prebuilts/sdk:public_current_android_sdk_java_import"]`,
 			}),
 		}})
 }
@@ -86,7 +87,10 @@ android_app {
         "resb/res.png",
     ]`,
 				"custom_package": `"com.google"`,
-				"deps":           `[":static_lib_dep"]`,
+				"deps": `[
+        "//prebuilts/sdk:public_current_android_sdk_java_import",
+        ":static_lib_dep",
+    ]`,
 			}),
 		}})
 }