Revert "msm: Add sysfs interface for mfreq"
Remove mfreq sysfs interface as the functionality to boost
CPU clocks to maximum is no longer needed.

This reverts commit c79a2e06447a6253f24142b0143ab9b1b2a1e488.

CRs-Fixed: 335675
Change-Id: Ic6f0ad40e15a0f6c234617a430387517d3556b0c
Signed-off-by: David Ng <dave@codeaurora.org>