dt-bindings: opp: opp-v2-kryo-cpu: Remove SMEM

qcom-cpufreq-nvmem no longer uses SMEM. Remove all references
to SMEM and change the description and maximum value of
opp-supported-hw to reflect the new set of possible values.

Signed-off-by: Yassine Oudjana <y.oudjana@protonmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>