common: return type board_get_usable_ram_top

board_get_usable_ram_top() returns a physical address that is stored in
gd->ram_top. The return type of the function should be phys_addr_t like the
current type of gd->ram_top.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/arch/x86/include/asm/u-boot-x86.h b/arch/x86/include/asm/u-boot-x86.h
index 02a8b0f..3acc58a 100644
--- a/arch/x86/include/asm/u-boot-x86.h
+++ b/arch/x86/include/asm/u-boot-x86.h
@@ -77,7 +77,7 @@
 void x86_enable_caches(void);
 void x86_disable_caches(void);
 int x86_init_cache(void);
-phys_size_t board_get_usable_ram_top(phys_size_t total_size);
+phys_addr_t board_get_usable_ram_top(phys_size_t total_size);
 int default_print_cpuinfo(void);
 
 /* Set up a UART which can be used with printch(), printhex8(), etc. */