sysinfo: Provide a default driver to set SMBIOS values

Some boards want to specify the manufacturer or product name but do not
need to have their own sysinfo driver.

Add a default driver which provides a way to specify this SMBIOS
information in the devicetree, without needing any board-specific
functionality.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/sysinfo/Makefile b/drivers/sysinfo/Makefile
index aecf0b0..6d04fcb 100644
--- a/drivers/sysinfo/Makefile
+++ b/drivers/sysinfo/Makefile
@@ -5,3 +5,4 @@
 obj-y += sysinfo-uclass.o
 obj-$(CONFIG_SYSINFO_GAZERBEAM) += gazerbeam.o
 obj-$(CONFIG_SYSINFO_SANDBOX) += sandbox.o
+obj-$(CONFIG_SYSINFO_SMBIOS) += smbios.o