PCI: modify PCI bridge control ISA flag for clarity

Modify PCI Bridge Control ISA flag for clarity

This patch changes PCI_BRIDGE_CTL_NO_ISA to PCI_BRIDGE_CTL_ISA
and modifies it's clarifying comment and locations where used.
The change reduces the chance of future confusion since it makes
the set/unset meaning of the bit the same in both the bridge
control register and bridge_ctl field of the pci_bus struct.

Signed-off-by: Gary Hade <garyhade@us.ibm.com>
Acked-by: Linas Vepstas <linas@austin.ibm.com>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index 055187b..42ba0e2 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -37,7 +37,7 @@
 skip_isa_ioresource_align(struct pci_dev *dev) {
 
 	if ((pci_probe & PCI_CAN_SKIP_ISA_ALIGN) &&
-	    (dev->bus->bridge_ctl & PCI_BRIDGE_CTL_NO_ISA))
+	    !(dev->bus->bridge_ctl & PCI_BRIDGE_CTL_ISA))
 		return 1;
 	return 0;
 }