V0.5.3

[zzxcanaan]

Fixes #32 Fixes #32 Fixes #34 Fixes #37 Fixes #38

• [x] I have thoroughly tested my contribution.

• [x] The code I submitted has no copyright issues.

• Major change

  • Modify KPU driver for latest model compiler
  • Add freertos
  • Add new gpiohs and wdt interrupt function
  • Add dvp xclk setting
  • Add sysctl reset status

• Non-breaking bug fixes

  • Fix i2c issues
  • Fix spi issues

• Breaking change

  • Fix uarths stopbit problem
  • Fix core1 stack problem
  • Fix core1 interrupt problem