regmap: Fix the type used for a bitmap pointer

Bitmaps should be defined as 'unsigned long', not 'long'.
Fix the type of 'cache_present' is the 'struct regcache_rbtree_node'.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/5600df5003d23da10efcfafbda97ca55776d0d29.1689960321.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: tititiou36

drivers/base/regmap/regcache-rbtree.c

@@ -22,7 +22,7 @@ struct regcache_rbtree_node {
 	/* block of adjacent registers */
 	void *block;
 	/* Which registers are present */
-	long *cache_present;
+	unsigned long *cache_present;
 	/* base register handled by this block */
 	unsigned int base_reg;
 	/* number of registers available in the block */