dt-bindings: marvell,mmp2: Add clock ids for MMP3 PLLs

MMP3 variant provides some more clocks. Add respective IDs.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lkml.kernel.org/r/20200309194254.29009-9-lkundrak@v3.sk


Signed-off-by: Stephen Boyd <sboyd@kernel.org>