ide: fix host drivers missing hwif->chipset initialization

ide_find_port() now depends on ->chipset being set for occupied ide_hwifs[]
slots so all host drivers have to initialize hwif->chipset properly.

This patch fixes a regression on hosts with > 1 port or with a single port
but no devices attached to it for an affected host drivers.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/ppc/mpc8xx.c b/drivers/ide/ppc/mpc8xx.c
index f0e638d..236f9c3 100644
--- a/drivers/ide/ppc/mpc8xx.c
+++ b/drivers/ide/ppc/mpc8xx.c
@@ -303,6 +303,8 @@
 	pcmp->pcmc_per = 0x100000 >> (16 * _slot_);
 #endif	/* CONFIG_IDE_8xx_PCCARD */
 
+	hw->chipset = ide_generic;
+
 	return 0;
 }
 #endif /* CONFIG_IDE_8xx_PCCARD || CONFIG_IDE_8xx_DIRECT */
@@ -377,6 +379,8 @@
 	((immap_t *) IMAP_ADDR)->im_siu_conf.sc_siel |=
 			(0x80000000 >> ioport_dsc[data_port].irq);
 
+	hw->chipset = ide_generic;
+
 	return 0;
 }
 #endif	/* CONFIG_IDE_8xx_DIRECT */