add support for STM32F103VE board yehuo-znz

[hitsmaxft]

1. add build section for yehuo znz (野火指南者开发板),

• user button pin K1/PA0 , press on state 1
• LED_PIN is pb0 , state 0 make it bright green
• PD6 is USB_DISC PIN
• enable fastboot

USB DISC

there are two buttons on these board , the other once is PC13