arm: a37xx: pci: Disable returning CRS response

There was mistake in commit 4cd61c43 ("arm: a37xx: pci: Fix handling
PIO config error responses"). U-Boot does not support handling of CRS
return value for PCI_VENDOR_ID config read request and also does not set
CRSSVE bit.

Therefore disable returning CRS response for now.

Signed-off-by: Pali Rohár <pali@kernel.org>
Fixes: 4cd61c43 ("arm: a37xx: pci: Fix handling PIO config error responses")
Reviewed-by: Stefan Roese <sr@denx.de>