Gralloc: Use handle reserved size while importing buffer am: af82c80bda

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/qcom/sm8150/display/+/22422376

Change-Id: If6c2e583be28edf0f004d4322a36ea4e47c40189
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>