kernel: Move to Linux v5.3.1-openpower1

This is the first v5.3 based kernel.

See https://kernelnewbies.org/Linux_5.3 for notable upstream changes
made for this release.

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 da79203..012a3f3 100644
--- a/openpower/linux/0001-xhci-Reset-controller-on-xhci-shutdown.patch
+++ b/openpower/linux/0001-xhci-Reset-controller-on-xhci-shutdown.patch
@@ -14,7 +14,7 @@
  1 file changed, 1 insertion(+)
 
 diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
-index 3f79f35d0b19..e0f5518e7f2f 100644
+index 03d1e552769b..1e1624f5be9f 100644
 --- a/drivers/usb/host/xhci.c
 +++ b/drivers/usb/host/xhci.c
 @@ -793,6 +793,7 @@ static void xhci_shutdown(struct usb_hcd *hcd)