clk: ti: Add ti_dt_clk_name() helper to use clock-output-names

Let's create the clock alias based on the clock-output-names property if
available. Also the component clock drivers can use ti_dt_clk_name() in
the following patches.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20220204071449.16762-7-tony@atomide.com


Signed-off-by: Stephen Boyd <sboyd@kernel.org>