msm: Change vendor name from 'qcom' to 'qti' for mpm_counter

As we have recently moved to use 'qti' as vendor name reflect
that change for all mpm_counter related code.

Change-Id: I1360e42a53136fe99cd7961e519599a64d4326f9
Signed-off-by: Kumar Gala <galak@codeaurora.org>