cpufreq/amd-pstate: Merge amd_pstate_epp_cpu_offline() and amd_pstate_epp_offline()

amd_pstate_epp_offline() is only called from within
amd_pstate_epp_cpu_offline() and doesn't make much sense to have it at all.
Hence, remove it.

Also remove the unncessary debug print in the offline path while at it.

Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20241204144842.164178-6-Dhananjay.Ugwekar@amd.com


Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>