Revert "cpufreq: amd-pstate: Fix the inconsistency in max frequency units"

This reverts commit 82590ce3 which is
commit e4731baa

 upstream.

It causes a regression in kernels older than 6.9.y, so drop it from
here.

Link: https://lore.kernel.org/r/18882bfe-4ca5-495c-ace5-b9bcab796ae5@amd.com
Reported-by: Lars Wendler <wendler.lars@web.de>
Cc: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com>
Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Gautham R. Shenoy <gautham.shenoy@amd.com>
Cc: Peter Jung <ptr1337@cachyos.org>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>