kernel: Move to Linux 4.17.4-openpower1

 powerpc/64s: Fix DT CPU features Power9 DD2.1 logic
 powerpc/64s/radix: Fix radix_kvm_prefetch_workaround paca access of not possible CPU
 powerpc/fadump: Unregister fadump on kexec down path.
 powerpc/powernv/cpuidle: Init all present cpus for deep states
 powerpc/powernv: copy/paste - Mask SO bit in CR
 powerpc/powernv/ioda2: Remove redundant free of TCE pages
 powerpc/ptrace: Fix enforcement of DAWR constraints
 powerpc/perf: Fix memory allocation for core-imc based on num_possible_cpus()
 powerpc/ptrace: Fix setting 512B aligned breakpoints with PTRACE_SET_DEBUGREG
 powerpc/pkeys: Detach execute_only key on !PROT_EXEC
 powerpc/mm/hash: Add missing isync prior to kernel stack SLB switch
 cpuidle: powernv: Fix promotion from snooze if next state disabled

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 a195d74..838a239 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 1/3] 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.