lib: lmb: rename lmb_get_unreserved_size to lmb_get_free_size

As a follow-up, change the name of the newly introduced function
'lmb_get_unreserved_size' to 'lmb_get_free_size', which is more
appropriate.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
[trini: Fix test/lib/lmb.c]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/lib/lmb.c b/lib/lmb.c
index 3407705..2efb48c 100644
--- a/lib/lmb.c
+++ b/lib/lmb.c
@@ -353,7 +353,7 @@
 }
 
 /* Return number of bytes from a given address that are free */
-phys_size_t lmb_get_unreserved_size(struct lmb *lmb, phys_addr_t addr)
+phys_size_t lmb_get_free_size(struct lmb *lmb, phys_addr_t addr)
 {
 	int i;
 	long j;