Added new board and DVFS and THS for H3 and H5 but I need some hint for the commit

Hi all
I have added Orange Pi PC 2 support and added the WIP support for DVFS and THS for Allwinner H3 and H5
But before moving on with the pull request I need some hint from the devs about the toolchain
With GCC 5.5.0 it is not possible to fit the uboot spl in the sram for H5 target, while it works with GCC 7.2.0 so I need to discuss how handle it