ANDROID: GKI: add allowed list for Exynosauto SoC

This patch adds GKI symbol list for Exynosauto SoC.
We need to add below 3 function symbols and it required
by DP MST of DRM(Direct Rendering Manager) driver.

3 function symbol(s) added
  'int drm_connector_set_path_property(struct drm_connector*, const char*)'
  'int drm_helper_probe_detect(struct drm_connector*, struct drm_modeset_acquire_ctx*, bool)'
  'int of_graph_get_endpoint_count(const struct device_node*)'

Bug: 313751443
Change-Id: I3a7e212f598d50f21ee2272ccb18ceaa5af72f42
Signed-off-by: Junho Cha <junhomax.cha@samsung.com>