cpufreq/amd-pstate: Move max_perf limiting in amd_pstate_update

Move up the max_perf limiting, so that we clamp the des_perf with the
updated max_perf.

Signed-off-by: Dhananjay Ugwekar <dhananjay.ugwekar@amd.com>
Link: https://lore.kernel.org/r/20250415082308.3341-1-dhananjay.ugwekar@amd.com


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