Sepolicy: Modify postinstall_dexopt

Grant fsetid as it was done for installd. Suppress write to
profile files.

(cherry picked from commit 006e160b)

Bug: 77958490
Test: m
Test: manual
Merged-In: I33f47db7c16f0eda41ffdb526cf43f8fa9484c62
Change-Id: I33f47db7c16f0eda41ffdb526cf43f8fa9484c62