Add arch options for NUC700 platform
nuc700: Add support for WBL (Winbond Boot Loader)
nuc700: Core architecture support + NUC745

This adds support for the common components in the core NUC7xx architecture.
It also includes NUC745 specifics.
nuc700: Add NUC700 support to the NUC900 SPI driver
nuc700: Add NUC700 support to the NUC900 AC97 driver