Merge "Phytium: Some basic information of Phytium FTC series cpu #122"

Add some basic information and description of Phytium FTC series cpus.

Include follow 4 commits:
* 0b18b0a dt-bindings: arm: Document Phytium FTC series cpu
  499d859 arm64: proton-pack: Add Phytium FTC310 CPU core to spectre-v2/v4 safelist
  079a97f arm64: kpti: Add Phytium FTC3xx/6xx CPU cores to kpti safelist
  77a2733 arm64: Add MIDR encoding for Phytium CPUs

Signed-off-by: Jiakun Shuai <[email protected]>
Signed-off-by: WangYuli <[email protected]>