cpufreq: ti: Allow all silicon revisions to support OPPs

More silicon revisions are being defined for AM62x, AM62Px, and AM62ax
SoCs. These silicon may also support currently establishes OPPs, so remove
the revision limitation in ti-cpufreq and thus determine if an OPP applies
with speed grade efuse parsing.

Signed-off-by: Judith Mendez <jm@ti.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>