clk: ti: add support for automatic clock alias generation

clk: ti: add support for automatic clock alias generation

Large portions of the OMAP framework still depend on the support of
having clock aliases in place, so add support functions for generating
these automatically.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>