[WIP] Upgrade to Debian 10

[Yi-Tseng]

Copies files from the upstream:

• REPO/buster
• docker/images/builder10
• builds/any/rootfs/buster

Other changes:

• Add #include <i2c/smbus.h> to some platform source code
• Add GCC_NO_WERROR to some platform
• Change buildroot mirror site (BUILDROOTMIRROR in setup.env)
• Add required package to builder image
• Add KVM platform support (for debugging)

TODO:

• Create a new builder image (builder10:1.3) instead of change the builder10:1.2
• Document about building the builder image if people wat to build it on their machine