Update XNNPACK and cpuinfo build rules for armhf

PiperOrigin-RevId: 306379613
diff --git a/BUILD.bazel b/BUILD.bazel
index 5f3e359..2ba2db6 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -3360,6 +3360,11 @@
 )
 
 config_setting(
+    name = "linux_armhf",
+    values = {"cpu": "armhf"},
+)
+
+config_setting(
     name = "android",
     values = {"crosstool_top": "//external:android/crosstool"},
 )