NXP LPSPI: Convert to native zephyr driver, remove MCUX shim

[decsny]

Convert the LPSPI driver completely to a native Zephyr driver.

Main commit message:

Remove the shim to the SDK driver, and only use direct register writes in the zephyr driver instead. This will save flash space.

Remove mcux branding from all code.

While doing this part of the rewrite, I discovered also some issues that I went ahead and fixed:
- The driver was hardcoded to always only use PCS 0 no matter what the user provided spi_config set slave to.
- Active high CS configuration was not respected.

Fixes an issue where SDK driver performed an althgorithm on 2,048 possible clock configurations before every transfer.
This was replaced with a binary search in the native version.
And make it so that this configuration does not need to happen every transfer, if the same spi_cfg is used, to improve performance.
Various optimizations also due to the fact that the use case is more clear than the SDK was written for, so we can be more straightforward and simpler.

Also, I have calculated the difference in the code size of the LPSPI driver in 3.7.0 (including HAL + shim driver) vs the version in this PR after all the recent changes, and have the following results:

Code Size Difference

Zephyr 3.7.0 LPSPI:
- 2.793 KB from HAL driver itself
- 1.488 KB from Zephyr shim driver
- 188 bytes from common Zephyr SPI code
= Total 4.465 KB (4,572 bytes)

Latest Changes + This PR (Hopefully Zephyr 4.1.0 LPSPI):
- 1.352 KB from CPU-based LPSPI specific driver (spi_nxp_lpspi.c)
- 1.230 KB from common LPSPI driver code (spi_nxp_lpspi_common.c)
- 190 bytes from common Zephyr SPI code
= Total 2.768 KB (2,834 bytes)

Tested on MCXN, pending testing on RT and MCXW

Depends on #84931
Depends on zephyrproject-rtos/hal_nxp#504
Depends on hardware testing for MCXW, and RT

[zephyrbot]

The following west manifest projects have changed revision in this Pull Request:

Name	Old Revision	New Revision	Diff
hal_nxp	zephyrproject-rtos/hal_nxp@49ff7e3 (master)	zephyrproject-rtos/hal_nxp#504	zephyrproject-rtos/hal_nxp#504/files

⛔ DNM label due to: 1 project with PR revision

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