PCI: Encourage resource request API users to supply driver name

PCI region request functions have a @name parameter (sometimes called
"res_name"). It is used in a log message to inform drivers about request
collisions, e.g., when another driver has requested that region already.

This message is only useful when it contains the actual owner of the
region, i.e., which driver requested it. So far, a great many drivers
misuse the @name parameter and just pass pci_name(), which doesn't result
in useful debug information.

Rename "res_name" to "name".

Detail @name's purpose in the docstrings.

Link: https://lore.kernel.org/r/20241203100023.31152-2-pstanner@redhat.com


Signed-off-by: Philipp Stanner <pstanner@redhat.com>
[bhelgaas: tweak comment wording to include "driver"]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>