QCamera2/HAL3: Increase max buffer count for 60fps encode

Issue: When system is loaded, 60fps video recording
shows several frame drops due to timing issues.

Fix: Increasing the buffers to 8 helps eliminating the buffer
drops for 2 minute recording

Ack-by: Ashvin Deodhar

BUG=28313712

Change-Id: I1d74b9c82ea8062523c4bac501d54e80df3ba64a
2 files changed