flounder: require bootloader 3.43.0.0115

Bug 17700685
Bug 17726570
Bug 18054865

Change-Id: I86c06d2a80364546ba3ff1d9227195d279a76c13
diff --git a/board-info.txt b/board-info.txt
index 0b6ce58..bf9794a 100644
--- a/board-info.txt
+++ b/board-info.txt
@@ -1,2 +1,2 @@
 board=flounder|flounder_lte
-require version-bootloader=3.43.0.0114
+require version-bootloader=3.43.0.0115