lenovo/t500: Add clone of Lenovo T400

The existing code for the Lenovo T400 works without changes on the
Lenovo T500.  Same HDA verbs are provided by Lenovo BIOS on both
laptops.

Change-Id: I300408a8a0ed00476aee6061925befc2822fb505
Signed-off-by: Francis Rowe <info@gluglug.org.uk>
Reviewed-on: https://review.coreboot.org/10545
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/mainboard/lenovo/t500/Kconfig.name b/src/mainboard/lenovo/t500/Kconfig.name
new file mode 100644
index 0000000..89c6087
--- /dev/null
+++ b/src/mainboard/lenovo/t500/Kconfig.name
@@ -0,0 +1,2 @@
+config BOARD_LENOVO_T500
+	bool "ThinkPad T500"