x86: Enable meminfo command

Enable this command for x86 boards as it is quite useful for seeing
where memory is.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 93efeae..4bc8b91 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -892,14 +892,14 @@
 
 config CMD_MEMINFO
 	bool "meminfo"
-	default y if SANDBOX
+	default y if SANDBOX || X86
 	help
 	  Display memory information.
 
 config CMD_MEMINFO_MAP
 	bool "- with memory map"
 	depends on CMD_MEMINFO
-	default y if SANDBOX
+	default y if SANDBOX || X86
 	help
 	  Shows a memory map, in addition to just the DRAM size. This allows
 	  seeing where U-Boot's memory area is, at the top of DRAM, as well as