cpufreq/amd-pstate: Drop needless EPP initialization

cpufreq/amd-pstate: Drop needless EPP initialization

The EPP value doesn't need to be cached to the CPPC request in
amd_pstate_epp_update_limit() because it's passed as an argument
at the end to amd_pstate_set_epp() and stored at that time.

Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Reviewed-by: Perry Yuan <perry.yuan@amd.com>
Tested-by: Dhananjay Ugwekar <dhananjay.ugwekar@amd.com>
Link: https://lore.kernel.org/r/20241012174519.897-4-mario.limonciello@amd.com
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>