Make tusb1210_chg_det_states static, fixing the following sparse warning:

drivers/phy/ti/phy-tusb1210.c:158:12: sparse: sparse:
 symbol 'tusb1210_chg_det_states' was not declared. Should it be static?

Fixes: 48969a56 ("phy: ti: tusb1210: Add charger detection")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20220411135440.558394-1-hdegoede@redhat.comSigned-off-by: Vinod Koul <vkoul@kernel.org>