Restore ARM CPU variation tests on builders.

After
https://boringssl.googlesource.com/boringssl/+/9351266ba520336aa082fd256386a46bd1382558,
all_tests.go now sees runtime.GOOS == "android".

Change-Id: If7c5ec448c2ea4bc7efff79acf9aaa55690eda04
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/39626
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>

util/all_tests.go

diff --git a/util/all_tests.go b/util/all_tests.go
index 4dd7f2c..aba4447 100644
--- a/util/all_tests.go
+++ b/util/all_tests.go
@@ -51,7 +51,7 @@
 )
 
 func simulateARMCPUsDefault() bool {
-	return runtime.GOOS == "linux" && (runtime.GOARCH == "arm" || runtime.GOARCH == "arm64")
+	return (runtime.GOOS == "linux" || runtime.GOOS == "android") && (runtime.GOARCH == "arm" || runtime.GOARCH == "arm64")
 }
 
 type test struct {