platform/x86: amd-pmc: adjust arguments for `amd_pmc_send_cmd`

Currently the "argument" for the "message" is listed as a boolean
value.  This works well for the commands used currently, but an
additional upcoming command will pass more data in the message.

Expand it to be a full 32 bit value.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20211020162946.10537-1-mario.limonciello@amd.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>