MIPS: pci-legacy: revert "use generic pci_enable_resources"

This mostly reverts commit 99bca615 ("MIPS: pci-legacy: use generic
pci_enable_resources"). Fixes regressions such as:
  ata_piix 0000:00:0a.1: can't enable device: BAR 0 [io  0x01f0-0x01f7] not
	claimed
  ata_piix: probe of 0000:00:0a.1 failed with error -22

The only changes from the strict revert are to fix checkpatch errors:
  ERROR: spaces required around that '=' (ctx:VxV)
  #33: FILE: arch/mips/pci/pci-legacy.c:252:
  +	for (idx=0; idx < PCI_NUM_RESOURCES; idx++) {
 	        ^

  ERROR: do not use assignment in if condition
  #67: FILE: arch/mips/pci/pci-legacy.c:284:
  +	if ((err = pcibios_enable_resources(dev, mask)) < 0)

Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>