mb/lenvovo/*: Clean mainboard.c and devicetree

* Move board specific SPI registers to devicetree
* Remove unused headers
* Remove obsolete methods
* Fix coding style
* Fix Thinkpad L520 SPI lvscc register

Except for Thinkpad L520, no functional change has been done,
just moving stuff around.

Change-Id: I692a5632030fe2fedbe9a90f86251000f1360fb2
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/19494
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/src/mainboard/lenovo/s230u/devicetree.cb b/src/mainboard/lenovo/s230u/devicetree.cb
index b9b38dd..35135a9 100644
--- a/src/mainboard/lenovo/s230u/devicetree.cb
+++ b/src/mainboard/lenovo/s230u/devicetree.cb
@@ -56,6 +56,10 @@
 			register "superspeed_capable_ports" = "0x0000000f"
 			register "xhci_overcurrent_mapping" = "0x00000c03"
 			register "xhci_switchable_ports" = "0x0000000f"
+
+			register "spi_uvscc" = "0x2005"
+			register "spi_lvscc" = "0x2005"
+
 			device pci 14.0 on # USB 3.0 Controller
 				subsystemid 0x17aa 0x2205
 			end