fontconfig: rename the patches directory

Rename the patches directory to files as we only have one version of fontconfig,
so the hassle of moving these files every upgrade can be avoided.

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

diff --git a/meta/recipes-graphics/fontconfig/fontconfig-2.10.2/Add-sysroot-option-to-fc-cache-and-fc-cat.patch b/meta/recipes-graphics/fontconfig/files/Add-sysroot-option-to-fc-cache-and-fc-cat.patch
similarity index 100%
rename from meta/recipes-graphics/fontconfig/fontconfig-2.10.2/Add-sysroot-option-to-fc-cache-and-fc-cat.patch
rename to meta/recipes-graphics/fontconfig/files/Add-sysroot-option-to-fc-cache-and-fc-cat.patch