Revert "USB: EHCI cpufreq fix"

Revert "USB: EHCI cpufreq fix"

This reverts commit 2de25cfac4bab419085f99f9801f9bb6290d3fc2.  It was
reported to cause a regression by Daniel Exner, and Arjan van de Ven
points out that we actually already have infrastructure in place for
setting limits on acceptable DMA latency that would be the much more
correct fix for the problem with some Broadcom EHCI controllers.

Fixed up trivial conflicts due to the changes to support big-endian host
controller descriptors in drivers/usb/host/{ehci-sched.c,ehci.h}.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>