regmap: Remove attribute packed from struct 'regcache_rbtree_node'

On one hand commit 28644c80 ("regmap: Add the rbtree cache support")
added 'regcache_rbtree_node' as packed structure, while on the other hand
commit e977145a ("[RBTREE] Add explicit alignment to sizeof(long)
for struct rb_node.") declared struct 'rb_node' as aligned.

Solve the ambiguity of placing aligned structure in a packed one by
removing the packed attribute from struct. This seems to be the behavior
of gcc anyway.

This removes the following warning (W=1):

  drivers/base/regmap/regcache-rbtree.c:36:1: warning: alignment 1 of 'struct regcache_rbtree_node' is less than 4 [-Wpacked-not-aligned]

Cc: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/base/regmap/regcache-rbtree.c

@@ -33,7 +33,7 @@ struct regcache_rbtree_node {
 	unsigned int blklen;
 	/* the actual rbtree node holding this block */
 	struct rb_node node;
-} __attribute__ ((packed));
+};
 
 struct regcache_rbtree_ctx {
 	struct rb_root root;