gopls: migrate internal/lsp to gopls/internal/lsp

This CL was created using the following commands:

    ./gopls/internal/migrate.sh
    git add .
    git codereview gofmt

For golang/go#54509

Change-Id: Iceeec602748a5e6f609c3ceda8d19157e5c94009
Reviewed-on: https://go-review.googlesource.com/c/tools/+/426796
gopls-CI: kokoro <noreply+kokoro@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
Reviewed-by: Peter Weinberger <pjw@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
diff --git a/gopls/main.go b/gopls/main.go
index f73eabf..837a01d 100644
--- a/gopls/main.go
+++ b/gopls/main.go
@@ -17,7 +17,7 @@
 	"os"
 
 	"golang.org/x/tools/gopls/internal/hooks"
-	"golang.org/x/tools/internal/lsp/cmd"
+	"golang.org/x/tools/gopls/internal/lsp/cmd"
 	"golang.org/x/tools/internal/tool"
 )