common-licenses: fix filename of BSD-2-Clause-Patent

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta/files/common-licenses/BSD-2-Clause-Patent.txt b/meta/files/common-licenses/BSD-2-Clause-Patent
similarity index 100%
rename from meta/files/common-licenses/BSD-2-Clause-Patent.txt
rename to meta/files/common-licenses/BSD-2-Clause-Patent