ARM: dts: msm: Use cpufreq node name for delete node for sdm632

When using label for delete node, it is actually
not take effect. Need to use qcom,cpufreq name
instead of msm_cpufreq for sdm632 platforms.

Change-Id: I2a233d17f0f962ff2c318c69e17a1bca5350e3e9
Signed-off-by: Maria Yu <aiquny@codeaurora.org>