drivers: i2s: use new k_mem_slab definition

Commit 2f003e5 ("kernel: Re-factor k_mem_slab definition") moved
block_size into from k_mem_slab to k_mem_slab_info without updating i2s
handlers. Use the new member to fix build failures.

Fixes: #63363

Signed-off-by: Tomasz Moń <[email protected]>

Author: tmon-nordic

drivers/i2s/i2s_handlers.c

@@ -33,7 +33,7 @@ static inline int z_vrfy_i2s_configure(const struct device *dev,
 	/* Ensure that the k_mem_slab's slabs are large enough for the
 	 * specified block size
 	 */
-	if (config.block_size > config.mem_slab->block_size) {
+	if (config.block_size > config.mem_slab->info.block_size) {
 		goto out;
 	}