lib/Kconfig: Correct typo about SYSINFO_SMBIOS in help message

The correct symbol to enable to have SMBIOS populate fields based on the
device tree is SYSINFO_SMBIOS and not SMBIOS_SYSINFO.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

lib/Kconfig

@@ -995,7 +995,7 @@ config GENERATE_SMBIOS_TABLE
 
 	  Check http://www.dmtf.org/standards/smbios for details.
 
-	  See also SMBIOS_SYSINFO which allows SMBIOS values to be provided in
+	  See also SYSINFO_SMBIOS which allows SMBIOS values to be provided in
 	  the devicetree.
 
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