[RESEND PATCHv2 01/28] clk: ti: add ti_clk_get helper API

* Tero Kristo [off-list ref] [160613 12:07]:

The API can be used to fetch directly DT clocks based on name. Using
this new API allows getting rid of most of the DT_CLK() entries under
drivers/clk/ti.

The description here is a bit confusing.. Rather than calling it API
how about say it's a helper function private to TI specific clock
code? Otherwise people might think it will be something more widely
available.

Regards,

Tony