vold: Branch out SW and HW FDE paths to improve boot up time

Currently, HW FDE makes changes in SW FDE path even if it does
not need what SW FDE computes. This is adding latencies in device
boot up time. Since boot up time is an important KPI, branching out
HW FDE code path to improve device boot up time.

Change-Id: I3f17338a7426026c952d409524c2d8708f7ac858
1 file changed