Move platform constraints to bazel_common_rules.

This enables sharing of platform constraints between platform and kernel builds.

Bug: 304594734

Test: treehugger
Change-Id: I48091eeaf2e529c3f180ba056da3935911868b14
diff --git a/bp2build/python_library_conversion_test.go b/bp2build/python_library_conversion_test.go
index 497df80..ad6a27b 100644
--- a/bp2build/python_library_conversion_test.go
+++ b/bp2build/python_library_conversion_test.go
@@ -25,7 +25,7 @@
 func convertPythonLibTestCaseToBp2build_Host(tc pythonLibBp2BuildTestCase) Bp2buildTestCase {
 	for i := range tc.expectedBazelTargets {
 		tc.expectedBazelTargets[i].attrs["target_compatible_with"] = `select({
-        "//build/bazel/platforms/os:android": ["@platforms//:incompatible"],
+        "//build/bazel_common_rules/platforms/os:android": ["@platforms//:incompatible"],
         "//conditions:default": [],
     })`
 	}
@@ -296,8 +296,8 @@
 				name: "foo",
 				attrs: AttrNameToString{
 					"srcs": `select({
-        "//build/bazel/platforms/arch:arm": ["arm.py"],
-        "//build/bazel/platforms/arch:x86": ["x86.py"],
+        "//build/bazel_common_rules/platforms/arch:arm": ["arm.py"],
+        "//build/bazel_common_rules/platforms/arch:x86": ["x86.py"],
         "//conditions:default": [],
     })`,
 					"srcs_version": `"PY3"`,