linux-aspeed: Move to v5.15.18 stable release

This includes security and bug fixes from the 5.15.15 through to
5.15.18 stable releases.

Change-Id: I71a0c4d8c134434725bba8e2a7deec37783550bc
Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/meta-aspeed/recipes-kernel/linux/linux-aspeed_git.bb b/meta-aspeed/recipes-kernel/linux/linux-aspeed_git.bb
index e5950e9..dd532fb 100644
--- a/meta-aspeed/recipes-kernel/linux/linux-aspeed_git.bb
+++ b/meta-aspeed/recipes-kernel/linux/linux-aspeed_git.bb
@@ -1,6 +1,6 @@
 KBRANCH ?= "dev-5.15"
-LINUX_VERSION ?= "5.15.14"
+LINUX_VERSION ?= "5.15.18"
 
-SRCREV="2383899f793d3c409c974dcb517579834c4a3674"
+SRCREV="abce5ba7169dbf9a66fe24acd93dd136da92fe00"
 
 require linux-aspeed.inc