clk: sunxi: document PRCM clock compatible strings
clk: sunxi: document PRCM clock compatible strings

Document new compatible strings for clock provided by the PRCM
(Power/Reset/Clock Management) unit.

Signed-off-by: Boris BREZILLON <4e91513d4f418754031d3d36b3fc73980c40a38c@free-electrons.com>
Signed-off-by: Emilio López <86fa523305b8ad6a8a853c04cfef24a0445908d3@elopez.com.ar>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs