If we have native control of AER, set the following error reporting enable
bits:

  - Correctable Error Reporting Enable
  - Non-Fatal Error Reporting Enable
  - Fatal Error Reporting Enable
  - Unsupported Request Reporting Enable

Note that these bits are all in the Device Control register and are not
AER-specific.

This affects all devices with an AER capability, including hot-added
devices.

Please note that this change is quite invasive, as error reporting now will
be enabled for all available PCIe Endpoints, which was previously not the
case.

When "pci=noaer" is selected, error reporting stays disabled of course.

[bhelgaas: commit log, note error reporting is not AER-specific]
Link: https://lore.kernel.org/r/20220125071820.2247260-4-sr@denx.deSigned-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Pali Rohár <pali@kernel.org>
Cc: Bharat Kumar Gogada <bharat.kumar.gogada@xilinx.com>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Yao Hongbo <yaohongbo@linux.alibaba.com>
Cc: Naveen Naidu <naveennaidu479@gmail.com>