[SCSI] aic79xx: fix warnings with CONFIG_PM disabled

  CC [M]  drivers/scsi/aic7xxx/aic79xx_osm_pci.o
drivers/scsi/aic7xxx/aic79xx_osm_pci.c:101: warning: 'ahd_linux_pci_dev_suspend' defined but not used
drivers/scsi/aic7xxx/aic79xx_osm_pci.c:121: warning: 'ahd_linux_pci_dev_resume' defined but not used

This moves aic79xx_pci_driver struct, removes some forward
declarations, and adds some ifdef CONFIG_PM.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/drivers/scsi/aic7xxx/aic79xx_pci.c b/drivers/scsi/aic7xxx/aic79xx_pci.c
index 7a203a9..df85367 100644
--- a/drivers/scsi/aic7xxx/aic79xx_pci.c
+++ b/drivers/scsi/aic7xxx/aic79xx_pci.c
@@ -389,6 +389,7 @@
 	return error;
 }
 
+#ifdef CONFIG_PM
 void
 ahd_pci_suspend(struct ahd_softc *ahd)
 {
@@ -415,6 +416,7 @@
 	ahd_pci_write_config(ahd->dev_softc, CSIZE_LATTIME,
 			     ahd->suspend_state.pci_state.csize_lattime, /*bytes*/1);
 }
+#endif
 
 /*
  * Perform some simple tests that should catch situations where