lib: sbi: fix covered regions handling in sanitize_domain()

In the sanitize_domain, code that checks for the case when one
memory region covered by the other, was never executed. Quote:

	/* Sort the memory regions */
	for (i = 0; i < (count - 1); i++) {
<snip>
	}

	/* Remove covered regions */
	while(i < (count - 1)) {

Here "while" loop never executed because condition "i < (count - 1)"
is always false after the "for" loop just above.

In addition, when clearing region, "root_memregs_count"
should be adjusted as well, otherwise code that adds memory region
in the "root_add_memregion" will use wrong position:

	/* Append the memregion to root memregions */
	nreg = &root.regions[root_memregs_count];

empty entry will be created in the middle of regions array, new
regions will be added after this empty entry while sanitizing code
will stop when reaching empty entry.

Fixes: 3b03cdd60c ("lib: sbi: Add regions merging when sanitizing domain region")
Signed-off-by: Vladimir Kondratiev <vladimir.kondratiev@mobileye.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20251111104327.1170919-2-vladimir.kondratiev@mobileye.com
Signed-off-by: Anup Patel <anup@brainfault.org>

lib/sbi/sbi_domain.c

@@ -431,7 +431,7 @@ static int sanitize_domain(struct sbi_domain *dom)
 	}
 
 	/* Remove covered regions */
-	while(i < (count - 1)) {
+	for (i = 0; i < (count - 1);) {
 		is_covered = false;
 		reg = &dom->regions[i];