synquacer: refactor HSSPI NOR flash driver and support Macronix device

This commit fully replaces the existing HSSPI
NOR flash driver to newly designed driver.

The new driver implements NOR flash read/program/erase/reset
APIs, and separates off the HSSPI controller specific module(hsspi)
and NOR flash specific module(nor).
With that, we can add the support of other devices such as
NAND flash device.

This commit supports the Macronix SPI NOR flash device.

Signed-off-by: Masashi Morimoto <morimoto.masashi@socionext.com>
Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Change-Id: Id8e50a6f6f6cd864a34eeed1d32814441c9da274