ANDROID: GKI: rockchip: add symbols for drm hdcp

2 function symbol(s) added
  'int drm_connector_attach_content_protection_property(struct drm_connector *, bool)'
  'void drm_hdcp_update_content_protection(struct drm_connector *, u64)'

Bug: 239396464
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Signed-off-by: Bian Jin chen <kenjc.bian@rock-chips.com>
Change-Id: I04b97183606cb6bcf565c5021559fa1038c161b1