Disable loading amd-pstate when the PM profile is a server or undefined

This mirrors the behavior used by Kernel 6.5 and later where amd-pstate
is configured to default into 'performance' by the kernel.  It's not
as useful in server to be changing it.

Link: https://github.com/torvalds/linux/commit/32f80b9adfdb43f8af248596724f59dde938a190