ANDROID: GKI: add allowed list for Exynosauto SoC

This patch adds GKI symbol list for Exynosauto SoC. We need to add
below 5 function symbols and it required by DRM(Direct Rendering Manager)
driver.

5 function symbol(s) added
  'void display_timings_release(struct display_timings*)'
  'int drm_helper_connector_dpms(struct drm_connector*, int)'
  'int drm_helper_probe_detect(struct drm_connector*, struct drm_modeset_acquire_ctx*, bool)'
  'uint32_t drm_of_crtc_port_mask(struct drm_device*, struct device_node*)'
  'int videomode_from_timings(const struct display_timings*, struct videomode*, unsigned int)'

Bug: 358921626
Signed-off-by: jangol.park <jangol.park@samsung.com>
Change-Id: Ic5b2ba16c0840f280ad19c918df7f1426b723648