kernel: Move to Linux v4.19.6-openpower1

PowerPC fixes (4.19.5, 4.19.6):

  powerpc/numa: Suppress "VPHN is not supported" messages
  powerpc/io: Fix the IO workarounds code to work with Radix

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower/linux/0001-xhci-Reset-controller-on-xhci-shutdown.patch b/openpower/linux/0001-xhci-Reset-controller-on-xhci-shutdown.patch
index 1b4f4bf..7218636 100644
--- a/openpower/linux/0001-xhci-Reset-controller-on-xhci-shutdown.patch
+++ b/openpower/linux/0001-xhci-Reset-controller-on-xhci-shutdown.patch
@@ -14,10 +14,10 @@
  1 file changed, 1 insertion(+)
 
 diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
-index 0420eefa647a..618fabbdb4cc 100644
+index c928dbbff881..2f5aff97f387 100644
 --- a/drivers/usb/host/xhci.c
 +++ b/drivers/usb/host/xhci.c
-@@ -796,6 +796,7 @@ static void xhci_shutdown(struct usb_hcd *hcd)
+@@ -794,6 +794,7 @@ static void xhci_shutdown(struct usb_hcd *hcd)
  	/* Yet another workaround for spurious wakeups at shutdown with HSW */
  	if (xhci->quirks & XHCI_SPURIOUS_WAKEUP)
  		pci_set_power_state(to_pci_dev(hcd->self.sysdev), PCI_D3hot);