board_f: Fix types for board_get_usable_ram_top()

Commit 37dc958947ed ("global_data.h: Change ram_top type to phys_addr_t")
changed type of ram_top member from ulong to phys_addr_t but did not
changed types in board_get_usable_ram_top() function which returns value
for ram_top.

So change ulong to phys_addr_t type also in board_get_usable_ram_top()
signature and implementations.

Fixes: 37dc958947ed ("global_data.h: Change ram_top type to phys_addr_t")
Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/board/menlo/m53menlo/m53menlo.c b/board/menlo/m53menlo/m53menlo.c
index 61ab384..4afc5aa 100644
--- a/board/menlo/m53menlo/m53menlo.c
+++ b/board/menlo/m53menlo/m53menlo.c
@@ -42,7 +42,7 @@
 
 static u32 mx53_dram_size[2];
 
-ulong board_get_usable_ram_top(ulong total_size)
+phys_size_t board_get_usable_ram_top(phys_size_t total_size)
 {
 	/*
 	 * WARNING: We must override get_effective_memsize() function here