power: fix current frequency index

power: fix current frequency index

During power initialization the pstate cpufreq api is
not setting the initial curr_idx of pstate_power_info
to corresponding current frequency index.

Without this the idx is always 0, which is causing the
below check to pass and returns without setting the initial
min/max frequency to system max frequency and this leads to
incorrect frequency settings when power_pstate_cpufreq_set_freq()
is called in the apps.

set_freq_internal(struct pstate_power_info *pi, uint32_t idx)
{
...

 /* Check if it is the same as current */
        if (idx == pi->curr_idx)
                return 0;
...
}

scenario 1:
If system has starting scaling min/max: 1000/1000, and want to
set this to 2200/2200, the max frequency gets updated but not min.

scenario 2:
If system has starting scaling min/max: 2200/1000, and want to set
to 2200/2200, the max, min frequency was not updated. Since no change
in max that should be ok, but min was also ignored, which will be fixed
now with the new changes.

Fixes: e6c6dc0f ("power: add p-state driver compatibility")
Cc: stable@dpdk.org
Signed-off-by: Reshma Pattan <reshma.pattan@intel.com>
Reviewed-by: Liang Ma <liang.j.ma@intel.com>