[MT6250/MT6260] Support BootROM USB download if the target flash is secure load.
[MT6260] Support MT6260 EFUSE Write function.
[MT6256] Fix the secure USB download fail in MT6256 platform.
[MT6280] Fix download security SW fail to flash.
[MT6280/MT6276M] Improve the USBSwitchTool for reducing the CPU consumption.
[MT6280/MT6276M] USBSwitchTool supports the rescue mode switch by the setting of USBSwitchTool.ini.