kernel: Move to Linux v5.2.9-openpower1

PowerPC releated fixes:

 powerpc: fix off by one in max_zone_pfn initialization for ZONE_DMA

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower/linux/0002-Release-OpenPower-kernel.patch b/openpower/linux/0002-Release-OpenPower-kernel.patch
index 7669486..6f7b738 100644
--- a/openpower/linux/0002-Release-OpenPower-kernel.patch
+++ b/openpower/linux/0002-Release-OpenPower-kernel.patch
@@ -9,13 +9,13 @@
  1 file changed, 1 insertion(+), 1 deletion(-)
 
 diff --git a/Makefile b/Makefile
-index 78bd926c8439..4bd787a6beff 100644
+index cfc667fe9959..67e8c2fb4ac6 100644
 --- a/Makefile
 +++ b/Makefile
 @@ -2,7 +2,7 @@
  VERSION = 5
  PATCHLEVEL = 2
- SUBLEVEL = 5
+ SUBLEVEL = 9
 -EXTRAVERSION =
 +EXTRAVERSION = -openpower1
  NAME = Bobtail Squid