flounder: increase system partition size

Update partition size in BoardConfig.mk to match bootloader 3.33.0.2105

Bug: 17060890
Change-Id: Ie3b266bf80e0c9355fa15079df1cfa085fe64eb9
diff --git a/BoardConfig.mk b/BoardConfig.mk
index ae6d4e2..162c38c 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -49,7 +49,7 @@
 BOARD_DISABLE_TRIPLE_BUFFERED_DISPLAY_SURFACES := true
 
 TARGET_USERIMAGES_USE_EXT4 := true
-BOARD_SYSTEMIMAGE_PARTITION_SIZE := 1342177280
+BOARD_SYSTEMIMAGE_PARTITION_SIZE := 2782920704
 # BOARD_USERDATAIMAGE_PARTITION_SIZE := 13287555072
 BOARD_CACHEIMAGE_PARTITION_SIZE := 268435456
 BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE := ext4