cpufrequtils aperf: MSR not readable differentiation

Tell the user whether he has to load the msr driver
or whether he has to be root to be able to read things.

Remove exclamation mark in output.

Signed-off-by: Thomas Renninger <trenn@suse.de>
Acked-by: Borislav Petkov <borislav.petkov@amd.com>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>