graphics common: fix AIDL BufferUsage calculation

This was hitting integer sanitization, which we are trying to turn on:
Before:
    VENDOR_MASK_HI = -65536L,
After:
    VENDOR_MASK_HI = -281474976710656L,

Bug: 148149098
Test: manually check output (see above).
Change-Id: I1e2d7c0225aec8bf67375eb6b0cdc919b4ece847