falco: add rtd2132 settings to device tree

Now that the rtd2132 device has the full settings the
panel timings need to be implemented. Sadly, the Tx timings
in the rtd2132 aren't 1:1 with the panel's Tx timings. Below
is the table equivalent:

  RTD2132 | Falco Panel
  --------+------------
     T1   |    T2
  --------+------------
     T2   | T8+T10+T12
  --------+------------
     T3   |    T14
  --------+------------
     T4   |    T15
  --------+------------
     T5   | T9+T11+T13
  --------+------------
     T6   |    T3
  --------+------------
     T7   |    T4
  --------+------------

Change-Id: I10a3ad475d6b9485a707eb49e31afd197fc8d24d
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/65858
Reviewed-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/4472
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

src/mainboard/google/falco/devicetree.cb

@@ -110,6 +110,27 @@ chip northbridge/intel/haswell
 			device pci 1f.2 on end # SATA Controller
 			device pci 1f.3 on # SMBus
 				chip drivers/i2c/rtd2132
+					# Panel Power Timings (1 ms units)
+					# Note: the panel Tx timings are very
+					# different from the LVDS bridge
+					# Tx timing settings. Below is a mapping
+					# for RTD2132 -> Panel timings.
+					# T1 = T2
+					# T2 = T8 + T10 + T12
+					# T3 = T14
+					# T4 = T15
+					# T5 = T9 + T11 + T13
+					# T6 = T3
+					# T7 = T4
+					register "t1" = "20"
+					register "t2" = "16"
+					register "t3" = "1"
+					register "t4" = "1"
+					register "t5" = "16"
+					register "t6" = "20"
+					register "t7" = "500"
+					# LVDS Swap settings are normal.
+					register "lvds_swap" = "0"
 					# Enable Spread Sprectrum at 1.0%
 					register "sscg_percent" = "0x10"
 					device i2c 35 on end