driconfig: Add support for device specific config

Add support for driconf overrides on a per-device level, for cases
where we don't want to override behavior for all devices supported
by a particular driver.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12135>

src/util/tests/xmlconfig.cpp

@@ -143,7 +143,7 @@ TEST_F(xmlconfig_test, copy_cache)
     * user's homedir/environment that would override us.
     */
    driParseConfigFiles(&cache, &options,
-                       0, "driver", "drm",
+                       0, "driver", "drm", NULL,
                        NULL, 0,
                        NULL, 0);
 
@@ -184,7 +184,7 @@ xmlconfig_test::drirc_init(const char *driver, const char *drm,
     * based on the setting of $HOME by meson.build.
     */
    driParseConfigFiles(&cache, &options,
-                       0, driver, drm,
+                       0, driver, drm, NULL,
                        app, appver,
                        engine, enginever);