Revert "cmd/dist: log CPU model when testing"

Revert "cmd/dist: log CPU model when testing"

Fails TestRepeatBootstrap.

This reverts CL 371474.

For #50146.

Change-Id: Ie4adda4e0229e153471301ca00fe2c1c694b4b2d
Reviewed-on: https://go-review.googlesource.com/c/go/+/378587
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>