spi: Use inclusive language

Replace "master" by "[host] controller" in the SPI core code and comments.
All the similar to the "slave" by "target [device]" changes.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20250313140340.380359-1-andriy.shevchenko@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>