ARM: dts: msm: Remove support for obsoleted speed bins on msm8226

Previously, there used to be a redundancy scheme where multiple speed
bins mapped to the same frequency. This reduancy scheme was never used
and is obsoleted to free resources.

Change-Id: I9ca3c4e0a809d1563a3d786521e3b54e54e06af5
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>