Load kernel modules in parallel

First, we load independent module in parallel, then we singly load
modules which have soft-dependencies. then remove them from dependency
list of other modules. Repeat these steps until all modules are loaded.

Bug: 180676019
Test: boot successfully, and save more than 400 ms on Pixel 6 Pro.
Signed-off-by: chungkai <chungkai@google.com>
Change-Id: Ib844cfee72d4049bd951528692c818b4fa6c8e8f