p10/kernel: Move to v5.10.50-openpower1

- Updated denali and rainier configs
- Manually rebased to v5.10.50 kernel
- Removed openpower/linux-p10 directory
- Updated skiroot_defconfig based on upstream master

Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
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 bb1f1b4..9380398 100644
--- a/openpower/linux/0001-xhci-Reset-controller-on-xhci-shutdown.patch
+++ b/openpower/linux/0001-xhci-Reset-controller-on-xhci-shutdown.patch
@@ -1,7 +1,7 @@
 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
 From: Brian King <brking@linux.vnet.ibm.com>
 Date: Wed, 25 Oct 2017 10:42:59 +1100
-Subject: [PATCH 01/19] xhci: Reset controller on xhci shutdown
+Subject: [PATCH 1/2] xhci: Reset controller on xhci shutdown
 
 Fixes kexec boot. Without a hard reset, some USB chips will fail to
 initialize in a kexec booted kernel.
@@ -14,10 +14,10 @@
  1 file changed, 3 insertions(+)
 
 diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
-index bad154f446f8..19a9bde309a6 100644
+index a8d97e23f601..308ab396bd88 100644
 --- a/drivers/usb/host/xhci.c
 +++ b/drivers/usb/host/xhci.c
-@@ -789,6 +789,9 @@ void xhci_shutdown(struct usb_hcd *hcd)
+@@ -793,6 +793,9 @@ void xhci_shutdown(struct usb_hcd *hcd)
  	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
  			"xhci_shutdown completed - status = %x",
  			readl(&xhci->op_regs->status));