mb/lenovo/t60: Fix override devicetrees

Commit c1dc2d5e68 (mb/lenovo/t60: Switch to override tree) converted
these boards to override trees, but some device nodes were missed.
Said nodes are essential, as `chip` configuration data is always tied
to device nodes. The resulting `static.c` contained multiple copies
of the `chip` configuration structs, but the wrong ones were hooked up.

The therefore missing configuration of the clockgen led to general
instability, especially with SMP under Linux (probably due to the
attempt to enter lower C states on an idle core). Passing `maxcpus=1`
to the Linux kernel served as a workaround.

Change-Id: I6c26d633d1860cf9a5415994444e75ae1c2e59ad
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43065
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/lenovo/t60/variants/t60/overridetree.cb

@@ -44,6 +44,7 @@ chip northbridge/intel/i945
 					register "has_bdc_detection" = "1"
 					register "bdc_gpio_num" = "7"
 					register "bdc_gpio_lvl" = "0"
+					device pnp ff.2 on end
 				end
 				chip superio/nsc/pc87384
 					device pnp 2e.2 off # Serial Port / IR
@@ -62,6 +63,7 @@ chip northbridge/intel/i945
 					register "regs" = "{ 0x2e, 0xf7, 0x3c,
 						 0x20, 0x01, 0x00, 0x1b, 0x01,
 						 0x54, 0xff, 0xff, 0x07 }"
+					device i2c 69 on end
 				end
 			end
 		end

src/mainboard/lenovo/t60/variants/z61t/overridetree.cb

@@ -57,6 +57,7 @@ chip northbridge/intel/i945
 					# vendor clockgen setup
 					register "regs" = "{ 0x6d, 0xff, 0xff,
 						0x20, 0x41, 0x7f, 0x18, 0x00 }"
+					device i2c 69 on end
 				end
 			end
 		end