tree fd033b70ae171d74f0e8ce7eb2dd6394964bce19
parent bbd8a3f6eb6786dfa6d4b7a0a18ebec9b7f67741
author Alex Van Damme <atv@google.com> 1590785272 -0700
committer Alex Van Damme <atv@google.com> 1591378157 -0700

Add DMA functionality to USB RX

- Use direct fifo reads for EP0, DMA for other endpoints.
- Reduces the time to flash rootfs by ~2 minutes (64M transfer takes ~2s
instead of ~6s)

Change-Id: Ic222e56ae4b265f2bb8d22cfb8d88e8cc1587298