Increase system image size to 2.5 GB

Fixed build breakge caused by insufficient image size.
BUG: 110198136

Change-Id: I12a4a43b522b7867ff789854cf5b76d13f2f5499
Signed-off-by: Weilun Du <wdu@google.com>
diff --git a/target/board/generic_arm64/BoardConfig.mk b/target/board/generic_arm64/BoardConfig.mk
index 0fa05e8..56f15de 100644
--- a/target/board/generic_arm64/BoardConfig.mk
+++ b/target/board/generic_arm64/BoardConfig.mk
@@ -73,8 +73,7 @@
 USE_OPENGL_RENDERER := true
 
 TARGET_USERIMAGES_USE_EXT4 := true
-# Partition size is default 1.5GB (1536MB) for 64 bits projects
-BOARD_SYSTEMIMAGE_PARTITION_SIZE := 1610612736
+BOARD_SYSTEMIMAGE_PARTITION_SIZE := 2684354560 # 2.5 GB
 BOARD_USERDATAIMAGE_PARTITION_SIZE := 576716800
 TARGET_COPY_OUT_VENDOR := vendor
 # ~100 MB vendor image. Please adjust system image / vendor image sizes