configure/bd_part_count: adapt to kernel 5.12

Moved cas_blk_get_part_count function to configure section after the
the disk's partitions table was changed to xarray.

Signed-off-by: Gal Hammer <gal.hammer@huawei.com>
Signed-off-by: Shai Fultheim <shai.fultheim@huawei.com>

modules/cas_cache/layer_cache_management.c

@@ -4,7 +4,6 @@
 */
 
 #include "cas_cache.h"
-#include "utils/utils_blk.h"
 #include "threads.h"
 
 extern u32 max_writeback_queue_size;