serial: set correct baud_base for EXSYS EX-41092 Dual 16950

Apparently the same card model has two IDs, so this patch
complements the commit 39aced68
adding the missing one.

Signed-off-by: Flavio Leitner <fbl@redhat.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>