clk: ti: change clk_ti_latch() signature

The clock access functions exported by the clk header use the
struct clk_ti_reg parameter to get the address of the register. This
must also apply to clk_ti_latch(). Changes to TI's clk-mux and
clk-divider drivers prevented the patch from generating compile errors.

Signed-off-by: Dario Binacchi <dariobin@libero.it>