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/cc_yasm_conversion_test.go b/bp2build/cc_yasm_conversion_test.go
index 55d4feb..c98e1a1 100644
--- a/bp2build/cc_yasm_conversion_test.go
+++ b/bp2build/cc_yasm_conversion_test.go
@@ -126,14 +126,14 @@
 			MakeBazelTarget("yasm", "foo_yasm", map[string]string{
 				"include_dirs": `["."]`,
 				"srcs": `select({
-        "//build/bazel/platforms/arch:x86": ["myfile.asm"],
+        "//build/bazel_common_rules/platforms/arch:x86": ["myfile.asm"],
         "//conditions:default": [],
     })`,
 			}),
 		}, makeCcLibraryTargets("foo", map[string]string{
 			"local_includes": `["."]`,
 			"srcs": `["main.cpp"] + select({
-        "//build/bazel/platforms/arch:x86": [":foo_yasm"],
+        "//build/bazel_common_rules/platforms/arch:x86": [":foo_yasm"],
         "//conditions:default": [],
     })`,
 		})...),
@@ -164,7 +164,7 @@
 			MakeBazelTarget("yasm", "foo_yasm", map[string]string{
 				"include_dirs": `["."]`,
 				"srcs": `["myfile.asm"] + select({
-        "//build/bazel/platforms/arch:x86": ["mysecondfile.asm"],
+        "//build/bazel_common_rules/platforms/arch:x86": ["mysecondfile.asm"],
         "//conditions:default": [],
     })`,
 			}),