linux-aspeed: Move to 5.1.5

This includes security and bug fixes from the 5.1.4 and 5.1.5 stable
releases.

Change-Id: I5ea97234afbafa429aab62651ce199697df8171f
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 57fd5c8..e432eed 100644
--- a/recipes-kernel/linux/linux-aspeed_git.bb
+++ b/recipes-kernel/linux/linux-aspeed_git.bb
@@ -1,6 +1,6 @@
 KBRANCH ?= "dev-5.1"
-LINUX_VERSION ?= "5.1.3"
+LINUX_VERSION ?= "5.1.5"
 
-SRCREV="abc342879fe395487e033034c9b6e82672053b88"
+SRCREV="42a312b1b9fe4c0acfe812e7e5d6ff43cf81bb0f"
 
 require linux-aspeed.inc