ANDROID: Incremental fs: Use 64-bit int for file_size when writing hash blocks

Bug: 153210803
Test: manual
Change-Id: Iafc888dbe906cd37e5b28dc2814f52aace175c0f
Signed-off-by: Yurii Zubrytskyi <zyy@google.com>
Git-commit: 114b0431
Git-repo: https://android.googlesource.com/kernel/common/


Signed-off-by: Sayali Lokhande <sayalil@codeaurora.org>