arm:dts: msm8953: Add clock-frequency property

This commit will remove the following error message at boot

[    0.006268] /cpus/cpu@0: Missing clock-frequency property
[    0.006279] /cpus/cpu@1: Missing clock-frequency property
[    0.006289] /cpus/cpu@2: Missing clock-frequency property
[    0.006300] /cpus/cpu@3: Missing clock-frequency property
[    0.006311] /cpus/cpu@100: Missing clock-frequency property
[    0.006322] /cpus/cpu@101: Missing clock-frequency property
[    0.006334] /cpus/cpu@102: Missing clock-frequency property
[    0.006347] /cpus/cpu@103: Missing clock-frequency property

Signed-off-by: Nancyjudge <botnancy1@gmail.com>