gopls/internal/regtest: re-enable android builder

Remove the exception for the Android amd64 builder, now that flakes are
fixed (though the exception didn't actually work anyway due to
golang/go#39460).

Also, accept the import reorganization applied by gopls.

Fixes golang/go#43554

Change-Id: I9a7cce35998cfa673699d74a487111e4daecf7ec
Reviewed-on: https://go-review.googlesource.com/c/tools/+/284935
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rebecca Stambler <rstambler@golang.org>

Author: findleyr

gopls/internal/regtest/runner.go

@@ -8,7 +8,6 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	exec "golang.org/x/sys/execabs"
 	"io"
 	"io/ioutil"
 	"net"
@@ -20,6 +19,8 @@ import (
 	"testing"
 	"time"
 
+	exec "golang.org/x/sys/execabs"
+
 	"golang.org/x/tools/gopls/internal/hooks"
 	"golang.org/x/tools/internal/jsonrpc2"
 	"golang.org/x/tools/internal/jsonrpc2/servertest"
@@ -308,7 +309,6 @@ var longBuilders = map[string]string{
 	"netbsd-arm-bsiegert":     "",
 	"solaris-amd64-oraclerel": "",
 	"windows-arm-zx2c4":       "",
-	"android-amd64-emu":       "golang.org/issue/43554",
 }
 
 func checkBuilder(t *testing.T) {