servicemanager: remove performance hack

See details in TODO.

This hack is either causing a bug or may be preventing us from solving
another bug. Until the more critical bug can be fixed, avoiding
early-boot reads of VINTF manifest files.

Bug: 151696835
Test: run, boot, check manifest logs that HAL services register
Change-Id: Iba34afe451026a30e695d6728b4172007aaf7fbd
Merged-In: Iba34afe451026a30e695d6728b4172007aaf7fbd