Busfreq

This merge needs to be done after the merge in librem5-devkit-tools

librem5-devkit-tools!89 (merged)

added 29 commits

• d147882e...f66b853b - 18 commits from branch librem5
• a9813ffd - devfreq branch testing
• 054e7e3c - build_uboot.sh: return to the working directory
• 236c7771 - build_uboot.sh: use the busfreq ATF
• 5b95113d - build_uboot.sh: finish adding the librem phone variants
• b03ef614 - build_uboot.sh: split out aft build and ddr copy
• f842361d - build_uboot.sh: drop out of tree mkimage
• a9f6e948 - build_uboot.sh: Use the more recent firmware from NXP
• 92452729 - build_uboot.sh: add the display port firmware as well
• b929ce1c - build_uboot.sh: use the corrcect defconfig for the phone
• fe59fccc - Fix the full boot image
• a562814c - build_uboot.sh: drop second librem5 target from bad rebase

Compare with previous version

merged

mentioned in commit 54d77f76