CL 138675 added the race detector support on Linux/ARM64, but it
didn't enable the race detector tests in cmd/dist (therefore in
all.bash). Enable them.

Updates #28848

Change-Id: I4306dad2fb4167021d568436076b9f535d7f6e07
Reviewed-on: https://go-review.googlesource.com/c/149967
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>