test: Register the initialisation test with meson

Register the test so that it can integrate with the meson test
framework.

To execute the test suite, use 'ninja test'.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

test/meson.build

@@ -1,3 +1,5 @@
 test_init = executable('test_init', 'init.cpp',
 		       link_with : libcamera,
 		       include_directories : inc)
+
+test('Initialisation test', test_init)