utils: add bit count and bit count mask

bdk/utils/util.h

@@ -84,6 +84,9 @@ typedef struct _nyx_storage_t
 	emc_table_t mtc_table[10];
 } nyx_storage_t;
 
+u8   bit_count(u32 val);
+u32  bit_count_mask(u8 bits);
+
 void exec_cfg(u32 *base, const cfg_op_t *ops, u32 num_ops);
 u32  crc32_calc(u32 crc, const u8 *buf, u32 len);