drivers: spi: Microchip MEC172x SPI fix for Zephyr 3.4 breakage

Zephyr version 3.4 changed the SPI context structure and macros
which broke the logic in the MEC172x SPI driver configuration API.
This was not detected by CI due to no tests for this driver are in
the tree. The driver now behaves like most other SPI drivers requiring
a different configuration structure pointer to be passed if any item
in the configuration changes.

Signed-off-by: Manimaran A <manimaran.a@microchip.com>