[Patch, testsuite]: Update MicroBlaze strings test

[Jeff Law]

On 11/8/20 10:58 PM, Nagaraju Mekala wrote:
> Hello All,
>
> for new scan-assembly output resulting in use of $LC label
>
> gcc/testsuite/ChangeLog:
>         * gcc.target/microblaze/others/strings1.c: Update
>         to include $LC label.

Thanks.  Installed on the trunk.

jeff