bullhead: Enable sdcardfs

Bug: 27794037
Signed-off-by: Daniel Rosenberg <drosen@google.com>
diff --git a/arch/arm64/configs/bullhead_defconfig b/arch/arm64/configs/bullhead_defconfig
index 7f0da6a..6653c09 100644
--- a/arch/arm64/configs/bullhead_defconfig
+++ b/arch/arm64/configs/bullhead_defconfig
@@ -627,6 +627,7 @@
 CONFIG_VFAT_FS=y
 CONFIG_TMPFS=y
 CONFIG_TMPFS_POSIX_ACL=y
+CONFIG_SDCARD_FS=y
 CONFIG_PSTORE=y
 CONFIG_PSTORE_CONSOLE=y
 CONFIG_PSTORE_PMSG=y