cmd: provide command to display SMBIOS information

U-Boot can either generated an SMBIOS table or copy it from a prior boot
stage, e.g. QEMU.

Provide a command to display the SMBIOS information.

Currently only type 1 and 2 are translated to human readable text.
Other types may be added later. Currently only a hexdump and the list of
strings is provided for these.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 06aae30..a86b570 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -232,6 +232,12 @@
 	help
 	  Display information about the SBI implementation.
 
+config CMD_SMBIOS
+	bool "smbios"
+	depends on SMBIOS
+	help
+	  Display the SMBIOS information.
+
 endmenu
 
 menu "Boot commands"