flash/nor: Add basic support for TI's MSPM0L/G family

Add basic flashing support for Texas Instruments MSPM0L, C and G
family of Cortex-M0 based micro-controllers.

This initial basic flashing support allows for controlling protection,
erase, write and read of non-main flash region.

This has been tested with:
* Valgrind (3.22.0):
  valgrind --leak-check=full --show-leak-kinds=all \
	--track-origins=yes --verbose
* Ubuntu clang version 20.0.0
 (++20241014053649+ed77df56f272-1~exp1~20241014053827.1987)

Valgrind-clean, no new Clang analyzer or sparse warnings have been
introduced.

Change-Id: I29b8055ea6da9c38c5b7b91bea1ec7581c5bc8ff
Co-developed-by: Henry Nguyen <h-nguyen8@ti.com>
Signed-off-by: Henry Nguyen <h-nguyen8@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/8384
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-by: zapb <dev@zapb.de>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

src/flash/nor/drivers.c

@@ -51,6 +51,7 @@ static const struct flash_driver * const flash_drivers[] = {
 	&mdr_flash,
 	&mrvlqspi_flash,
 	&msp432_flash,
+	&mspm0_flash,
 	&niietcm4_flash,
 	&npcx_flash,
 	&nrf5_flash,