platform/x86: pmc_atom: Amend comment style and grammar

The style of the comments is not uniform, make it so and fix
a few grammar issues. While at it, update Copyright years.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220801113734.36131-4-andriy.shevchenko@linux.intel.com


Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>