spi: aspeed: Add support for the AST2700 SPI controller

spi: aspeed: Add support for the AST2700 SPI controller

Extend the driver to support the AST2700 SPI controller. Compared to
AST2600, AST2700 has the following characteristics:
 - A 64-bit memory address space.
 - A 64KB address decoding unit.
 - Segment registers now use (start <= range < end) semantics,
   which differs slightly from (start <= range <= end) in AST2600.
 - Known issues related to address decoding range registers have been
   resolved, and the decoding range is now 1GB, which is sufficient.
   Therefore, the adjust_window callback is no longer required on AST2700
   for range adjustment and bug fixes.
 - The SPI clock divider method and timing calibration logic remain
   unchanged from AST2600.

Signed-off-by: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
Link: https://patch.msgid.link/20251114101042.1520997-5-chin-ting_kuo@aspeedtech.com
Signed-off-by: Mark Brown <broonie@kernel.org>