iwlwifi: pcie: retrieve and parse ACPI power limitations
Some platforms may have power limitations on PCIe cards connected to
specific root ports.
This information is encoded as part of the ACPI tables, for instance:
<snip>
Name (SPLX, Package (0x02)
{
Zero,
Package (0x03)
{
0x07,
0x00000500,
0x80000000
}
})