mips: octeon: Report full DDR size in dram_init() to gd->ram_size

With this patch, gd->ram_size now holds to full RAM size detected by the
DDR init code. It introduces the get_effective_memsize() function to
report the maximum usable RAM size in U-Boot to the system instead.
Signed-off-by: NStefan Roese <sr@denx.de>
Cc: Aaron Williams <awilliams@marvell.com>
Cc: Chandrakala Chavva <cchavva@marvell.com>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: NDaniel Schwierzeck <daniel.schwierzeck@gmail.com>

arch/mips/mach-octeon/dram.c

@@ -33,7 +33,7 @@ int dram_init(void)
 			return ret;
 		}
 
-		gd->ram_size = min_t(size_t, ram.size, UBOOT_RAM_SIZE_MAX);
+		gd->ram_size = ram.size;
 		debug("SDRAM base=%lx, size=%lx\n",
 		      (unsigned long)ram.base, (unsigned long)ram.size);
 	} else {
@@ -72,6 +72,11 @@ void board_add_ram_info(int use_default)
 	}
 }
 
+phys_size_t get_effective_memsize(void)
+{
+	return UBOOT_RAM_SIZE_MAX;
+}
+
 ulong board_get_usable_ram_top(ulong total_size)
 {
 	if (IS_ENABLED(CONFIG_RAM_OCTEON)) {