Transaction: Use high priority workqueues for I2C

Transactions sometimes can be preempted by other threads (even threads
from Lyric nodes and drivers) which causes delay in register programming
that leads to frame drops. Sensor driver, especially, has shown
significant performance improvement after switching to high priority
workqueues.

Bug: 197676791
Test: GCA, CTS
Signed-off-by: Edmond Chung <edmondchung@google.com>
Change-Id: I5e901a7f29c53a29b09ff260f6d24bf61e2b23d0