IPQ40xx: clk: Use dt-bindings instead of hardcoding

Its common to use dt-bindings instead of hard-coding clocks or resets.
So lets use the imported Linux GCC bindings on IPQ40xx target.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>