Update TI clksel clocks to use reg

Updates for TI clksel clocks to use the standard reg property instead of
the non-standard ti,bit-shift legacy property.

There are still lots of TI composite clock related devicetree warnings for
missing bindings, and overlapping reg properties. We have grouped some of
the TI composite clocks under the clksel clock node, but did not consider
the reg property issue. Let's update the existing users before we continue
grouping more of the composite clocks.
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