k_mem_slab struct

_wait_q_t is not required now, as we don't implement zephyr timeouts - if slab couldn't be allocated, we simply return error.

number of memory blocks available for allocation.

size of single block buffer for blocks - must be alligned to N-byte, where N is a power of 2. Minimal size of buffer is num_blocks * block_size.

list of free memory blocks.