cf/vendor: Bump vendor image size to 256MB

The aosp master build fails to build vendor.img due to lack of space, so
bump it up from 96M to 256M.

Bug: 129866447
Bug: 126197773
Test: lunch aosp_cf_x86_64_phone-userdebug; m -j (build vendor.img)

Change-Id: Iaa26f3e36f8afa32f40e9055bb29eb19752b9896
Signed-off-by: Sandeep Patil <sspatil@google.com>
(cherry picked from commit acfc5b50d6ee100138505dccdefe3eb8d3cf36c1)
diff --git a/shared/BoardConfig.mk b/shared/BoardConfig.mk
index 948989a..0f1b464 100644
--- a/shared/BoardConfig.mk
+++ b/shared/BoardConfig.mk
@@ -23,7 +23,7 @@
 # Build a separate vendor.img partition
 BOARD_USES_VENDORIMAGE := true
 BOARD_VENDORIMAGE_FILE_SYSTEM_TYPE := ext4
-BOARD_VENDORIMAGE_PARTITION_SIZE := 100663296 # 96MB
+BOARD_VENDORIMAGE_PARTITION_SIZE := 268435456 # 256MB
 TARGET_COPY_OUT_VENDOR := vendor
 
 BOARD_USES_METADATA_PARTITION := true