samples: userspace: shared_mem: remove mimxrt700_evk cm33 cores

The number of mpu regions that can be configured is less than four cases.
Therefore, only remove this case on cm33 cores, failed log show below:
"num_parts of 4 exceeds maximum allowable partitions (3)"

samples: kernel: mem_protect: userspace: remove mimxrt700_evk cm33 cores

The maximum number of partitions is less than the number of partitions
currently required, causing case to be unable to apply for or delete
excess regions.

Signed-off-by: Lucien Zhao <lucien.zhao@nxp.com>