boards.yaml: add bluey board

BUG=b:399298031
TEST=Emerge bmpblk for bluey.

Change-Id: Id4df397ff168c630454a09ca8ce11416a4852987
Signed-off-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/bmpblk/+/6483347
Tested-by: Kapil Porwal <kapilporwal@chromium.org>
Reviewed-by: Hsuan Ting Chen <roccochen@chromium.org>
Commit-Queue: Subrata Banik <subratabanik@chromium.org>
Tested-by: Subrata Banik <subratabanik@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-by: Subrata Banik <subratabanik@chromium.org>
Commit-Queue: Kapil Porwal <kapilporwal@chromium.org>

boards.yaml

diff --git a/boards.yaml b/boards.yaml
index 1dae8fa..0b36a32 100644
--- a/boards.yaml
+++ b/boards.yaml
@@ -403,3 +403,7 @@
   dpi: 72  # DO NOT COPY-PASTE -- follow instructions at top of file.
   split_ratio: 100 # DO NOT COPY-PASTE -- follow instructions at top of file.
 
+bluey:
+  # 1920x1080, boots recovery image on any SD card or USB ports.
+  dpi: 96  # DO NOT COPY-PASTE -- follow instructions at top of file.
+