* [bsp][lpc55sxx] add support of LPC5528/LPC55S28

1. add .ignore_format
2. add support of LPC55S28
3. fix LPC55S69 keil comiple error
3. refine README

* [bsp][lpc55sxx]

1. remove cmake file
2. formating code using rt-thread formating tools
3. CMSIS folder -> ../

* [bsp][lpc55s69]

 - add IAR support(IAR version: 9.30.1)