sapphire: Add board-info.txt

* Fixes flashall in fastbootd

Change-Id: Iae2f33113317cfaadeff7a3610463880077c35e0
Signed-off-by: ReStranger <restranger@disroot.org>
diff --git a/board-info.txt b/board-info.txt
new file mode 100644
index 0000000..22afdda
--- /dev/null
+++ b/board-info.txt
@@ -0,0 +1 @@
+require board=bengal|sapphire|sapphiren
\ No newline at end of file