google/intel mainboards: Add missing board_info.txt files

The lint script didn't catch that these mainboard directories didn't
have board_info files.

Add all missing board_info.txt files

Change-Id: Ib1d61a3c04e91b22480527885faf60c22093d98a
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/14117
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins)
diff --git a/src/mainboard/intel/kunimitsu/board_info.txt b/src/mainboard/intel/kunimitsu/board_info.txt
new file mode 100644
index 0000000..acf033c
--- /dev/null
+++ b/src/mainboard/intel/kunimitsu/board_info.txt
@@ -0,0 +1,6 @@
+Vendor name: Intel
+Board name: Kunimitsu Skylake Reference Board
+Category: laptop
+ROM protocol: SPI
+ROM socketed: n
+Flashrom support: y