spi_nxp_lpspi: Fix Kconfig description

The Kconfig description is wrong, this driver can be used with or
without RTIO. Also, rename the kconfig to be less confusing, as _NORMAL
is meaningless, this is the CPU/interrupt based driver.

Signed-off-by: Declan Snyder <[email protected]>

Author: decsny

drivers/spi/spi_nxp_lpspi/CMakeLists.txt

@@ -1,5 +1,5 @@
 # Copyright 2024 NXP
 
 zephyr_library_sources_ifdef(CONFIG_SPI_MCUX_LPSPI spi_nxp_lpspi_common.c)
-zephyr_library_sources_ifdef(CONFIG_SPI_MCUX_LPSPI_NORMAL spi_nxp_lpspi.c)
+zephyr_library_sources_ifdef(CONFIG_SPI_MCUX_LPSPI_CPU spi_nxp_lpspi.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_MCUX_LPSPI_DMA spi_nxp_lpspi_dma.c)

drivers/spi/spi_nxp_lpspi/Kconfig

@@ -20,11 +20,11 @@ config SPI_MCUX_LPSPI_DMA
 	  Enable the SPI DMA mode for SPI instances
 	  that enable dma channels in their device tree node.
 
-config SPI_MCUX_LPSPI_NORMAL
+config SPI_MCUX_LPSPI_CPU
 	bool "NXP MCUX LPSPI driver"
 	default y
 	depends on $(dt_compat_any_not_has_prop,$(DT_COMPAT_NXP_LPSPI),dmas) || !SPI_MCUX_LPSPI_DMA
 	help
-	  Use the traditional (non-RTIO) SPI driver for NXP LPSPI.
+	  Use the CPU-based LPSPI driver.
 
 endif # SPI_MCUX_LPSPI