Suppress sizeof warnings on unusual malloc

These calls are unusual to use sizeof(T1) and cast result to (T2*).
The code look correct and intentional.
So we use NOLINTNEXTLINE to suppress the warning.

Bug: 261919363
Test: make tidy-frameworks-av-media-libstagefright_subset
Change-Id: Iba72049e40b69d091c14b7237498d45291556ae8