clk: ti: Handle possible address in the node name

In order to use #address-cells = <1> and start making use of the
standard reg property, let's prepare things to ignore the possible
address in the clock node name.

Unless the clock-output-names property is used, the legacy clocks still
fall back to matching the clock data based on the node name.

We use cleanup.h to simplify the return path for freeing tmp.

Acked-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>