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/go_conversion_test.go b/bp2build/go_conversion_test.go
index 2387641..ebd241d 100644
--- a/bp2build/go_conversion_test.go
+++ b/bp2build/go_conversion_test.go
@@ -84,8 +84,8 @@
         "foo1.go",
         "foo2.go",
     ] + select({
-        "//build/bazel/platforms/os:darwin": ["foo_darwin.go"],
-        "//build/bazel/platforms/os:linux_glibc": ["foo_linux.go"],
+        "//build/bazel_common_rules/platforms/os:darwin": ["foo_darwin.go"],
+        "//build/bazel_common_rules/platforms/os:linux_glibc": ["foo_linux.go"],
         "//conditions:default": [],
     })`,
 			},
@@ -98,8 +98,8 @@
         "foo1_test.go",
         "foo2_test.go",
     ] + select({
-        "//build/bazel/platforms/os:darwin": ["foo_darwin_test.go"],
-        "//build/bazel/platforms/os:linux_glibc": ["foo_linux_test.go"],
+        "//build/bazel_common_rules/platforms/os:darwin": ["foo_darwin_test.go"],
+        "//build/bazel_common_rules/platforms/os:linux_glibc": ["foo_linux_test.go"],
         "//conditions:default": [],
     })`,
 				},