meson: rename options file

Meson can use a new file name for the options files, so go ahead and
leverage it.  This allows editors to potentially understand the syntax
as something distinct from a raw ASCII text file.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I12c0c46d2f15ea9085bc0077e4780b04d7de0c06
1 file changed