Add to support Accton As6700_32x

There are two patches. One is intend to fix the eSPI issue in the fsl kernel, the other is to support Accton AS6700_32x.

For AS6700_32X, we prefer/recommend to stay the SPI NOR flash driver in the machine's kernel patch directory because:
1. the driver isn't common enough
2. the driver is sensitive that any change may affect the functionality

Thank you very much.