Bump generic_mips BOARD_SYSTEMIMAGE_PARTITION_SIZE for PRODUCT_RUNTIME := libart_runtime_default

(cherry picked from commit c8501bffcb6fa3f552ae424a5701091b5faa6270)

Change-Id: I12ce7c4e383e74e54d77b54a0406d2499699edbf
diff --git a/target/board/generic_mips/BoardConfig.mk b/target/board/generic_mips/BoardConfig.mk
index e6f43af..e16374b 100644
--- a/target/board/generic_mips/BoardConfig.mk
+++ b/target/board/generic_mips/BoardConfig.mk
@@ -50,7 +50,7 @@
 USE_OPENGL_RENDERER := true
 
 TARGET_USERIMAGES_USE_EXT4 := true
-BOARD_SYSTEMIMAGE_PARTITION_SIZE := 576716800
+BOARD_SYSTEMIMAGE_PARTITION_SIZE := 681574400
 BOARD_USERDATAIMAGE_PARTITION_SIZE := 209715200
 BOARD_CACHEIMAGE_PARTITION_SIZE := 69206016
 BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE := ext4