clk: ti: Optionally parse IO address from parent clock node

If no reg property is specified for a TI clock, let's try to use the
parent clock node IO address. This way we can avoid duplicate devicetree
reg properties that cause warnings for unique_unit_address.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20220204071449.16762-4-tony@atomide.com


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