spi: intel: Port 0 needs gpio driver to be ready if using it for CS

GPIO driver is initialized at pre-kernel-late level, if SPI does it too,
it will happen before GPIO (depends on the ordered list of
initialization). In order to ensure it gets GPIO initialized always
before SPI, let's set SPI to initalize at the next level: nano-early.

Change-Id: I6e34168c88fca0187a809bf5c7971492bd5acb5c
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>