toolchain: Override __INTN_C macros to match Zephyr stdint types
toolchain: Override __INTN_C macros to match Zephyr stdint types

This commit overrides the toolchain internal `__INTN_C(value)` integer
constant macros to match the types defined by the `zephyr_stdint.h`
header.

For more details, refer to the GitHub issue #44199.

Signed-off-by: Stephanos Ioannidis <dc76e9f0c0006e8f919e0c515c66dbba3982f785@stephanos.io>

finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr