google mainboards: select SYSTEM_TYPE_LAPTOP where appropriate

Some Google boards are missing this selection, leading them to being
incorrectly identified as type 'Desktop' in SMBIOS type 3 table.
Correct this by adding 'select SYSTEM_TYPE_LAPTOP' to the boards'
Kconfigs.

TEST: boot Linux and check correct chassis type listed via dmidecode

Change-Id: Ib1145e314812a3f300cfd1a435a687aa0862158a
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/22340
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/src/mainboard/google/cyan/Kconfig b/src/mainboard/google/cyan/Kconfig
index 0ecb317..7b8fd44 100644
--- a/src/mainboard/google/cyan/Kconfig
+++ b/src/mainboard/google/cyan/Kconfig
@@ -13,6 +13,7 @@
 	select SOC_INTEL_BRASWELL
 	select HAVE_ACPI_RESUME
 	select PCIEXP_L1_SUB_STATE if !BOARD_GOOGLE_CYAN
+	select SYSTEM_TYPE_LAPTOP
 
 if BOARD_GOOGLE_BASEBOARD_CYAN