FP4: Decrease system reserved space

Leave 90MB free before reaching super warning limit to allow
future builds growth. Fixes build warning.

Change-Id: Iafe6efea33cf15c72f396b1fd6013942ba06c5dd
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 7515aba..f9fb1ab 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -153,7 +153,7 @@
 BOARD_PRODUCTIMAGE_EXTFS_INODE_COUNT := -1
 BOARD_PRODUCTIMAGE_PARTITION_RESERVED_SIZE := 614400000
 BOARD_SYSTEMIMAGE_EXTFS_INODE_COUNT := -1
-BOARD_SYSTEMIMAGE_PARTITION_RESERVED_SIZE := 3466620928
+BOARD_SYSTEMIMAGE_PARTITION_RESERVED_SIZE := 3158932684
 BOARD_SYSTEM_EXTIMAGE_EXTFS_INODE_COUNT := -1
 BOARD_SYSTEM_EXTIMAGE_PARTITION_RESERVED_SIZE := 92160000
 endif