x86/PCI: Add NumaChip SPDX GPL-2.0 to replace COPYING boilerplate

x86/PCI: Add NumaChip SPDX GPL-2.0 to replace COPYING boilerplate

Add SPDX GPL-2.0 to numachip.c, which referred to the kernel default
"COPYING" file, which specifies GPL version 2.

Remove the boilerplate language referring to the GPL and "COPYING", relying
on the assertion in b24413180f56 ("License cleanup: add SPDX GPL-2.0
license identifier to files with no license") that the SPDX identifier may
be used instead of the full boilerplate text.

[bhelgaas: split to separate patch]
Link: https://lore.kernel.org/r/20190828135322.10370-1-kw@linux.com
Signed-off-by: Krzysztof Wilczynski <kw@linux.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>