linux-aspeed: Move to 4.19.15

This includes security and bug fixes from the 4.19.15 stable release.

Change-Id: Icb4f8caec5693b7cbb86b9856e399610b117770f
Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/recipes-kernel/linux/linux-aspeed_git.bb b/recipes-kernel/linux/linux-aspeed_git.bb
index af6463e..19160e0 100644
--- a/recipes-kernel/linux/linux-aspeed_git.bb
+++ b/recipes-kernel/linux/linux-aspeed_git.bb
@@ -1,6 +1,6 @@
 KBRANCH ?= "dev-4.19"
-LINUX_VERSION ?= "4.19.14"
+LINUX_VERSION ?= "4.19.15"
 
-SRCREV="659bbe7f501770c49248b1c74a700342e8957273"
+SRCREV="4f641ea0f1ec3ec5fa667ee9825e8bb5967da8a0"
 
 require linux-aspeed.inc