google/terra: add new board as variant of cyan baseboard

Add support for google/terra (Asus Chromebook C202SA/C300SA) as
a variant of the cyan Braswell baseboard.

- Add board-specific code as the new terra variant
- Add code to the baseboard to handle terra's unique thermal management
- Add new shared SPD files to baseboard

Sourced from Chromium branch firmware-terra-7287.154.B,
commit 153f08a: Revert "Revert "soc/intel/braswell: Populate NVS SCC BAR1""

Change-Id: Ib2682eda15a989f2ec20c78317561f5b6a97483a
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/21570
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/mainboard/google/cyan/Kconfig b/src/mainboard/google/cyan/Kconfig
index 9e5bc8a..650ef9a 100644
--- a/src/mainboard/google/cyan/Kconfig
+++ b/src/mainboard/google/cyan/Kconfig
@@ -44,12 +44,14 @@
 	default "cyan" if BOARD_GOOGLE_CYAN
 	default "edgar" if BOARD_GOOGLE_EDGAR
 	default "reks" if BOARD_GOOGLE_REKS
+	default "terra" if BOARD_GOOGLE_TERRA
 
 config MAINBOARD_PART_NUMBER
 	string
 	default "Cyan" if BOARD_GOOGLE_CYAN
 	default "Edgar" if BOARD_GOOGLE_EDGAR
 	default "Reks" if BOARD_GOOGLE_REKS
+	default "Terra" if BOARD_GOOGLE_TERRA
 
 config MAINBOARD_VENDOR
 	string
@@ -60,6 +62,7 @@
 	default "variants/cyan/devicetree.cb" if BOARD_GOOGLE_CYAN
 	default "variants/edgar/devicetree.cb" if BOARD_GOOGLE_EDGAR
 	default "variants/reks/devicetree.cb" if BOARD_GOOGLE_REKS
+	default "variants/terra/devicetree.cb" if BOARD_GOOGLE_TERRA
 
 config VGA_BIOS_FILE
 	string
@@ -84,5 +87,6 @@
 	default "CYAN TEST A-A 1829" if BOARD_GOOGLE_CYAN
 	default "EDGAR TEST A-A 2507" if BOARD_GOOGLE_EDGAR
 	default "REKS TEST A-A 3004" if BOARD_GOOGLE_REKS
+	default "TERRA TEST A-A 1650" if BOARD_GOOGLE_TERRA
 
 endif # BOARD_GOOGLE_BASEBOARD_CYAN