[nrf fromlist] tests: portability: cmsis_rtos_v2: do not disable 64-bit timeouts

Some code that automatically gets embedded on some platforms relies
on having `CONFIG_TIMEOUT_64BIT` enabled.
Do not force disabling that Kconfig option in the test configuration,
as that will make the test fail to compile on those platforms.

Signed-off-by: Tomi Fontanilles <[email protected]>
(cherry picked from commit 6d8093fed39893821643659925ab378c2d1c48a5)

Upstream PR #: 80632

Signed-off-by: Tomi Fontanilles <[email protected]>

Author: tomi-font

tests/subsys/portability/cmsis_rtos_v2/prj.conf

@@ -13,7 +13,6 @@ CONFIG_SCHED_SCALABLE=y
 CONFIG_CMSIS_V2_MEM_SLAB_MAX_DYNAMIC_SIZE=128
 CONFIG_CMSIS_V2_THREAD_MAX_COUNT=23
 CONFIG_CMSIS_V2_THREAD_DYNAMIC_MAX_COUNT=10
-CONFIG_TIMEOUT_64BIT=n
 CONFIG_CMSIS_V2_THREAD_MAX_STACK_SIZE=1024
 CONFIG_CMSIS_V2_THREAD_DYNAMIC_STACK_SIZE=1024
 CONFIG_MP_MAX_NUM_CPUS=1