linux-aspeed: Move to 5.4.23

This includes security and bug fixes from the 5.4.22 and 5.4.23 stable
releases.

Change-Id: I33d86e4aa1c29fb78a5aa4cb438ce2d139eedb03
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 2884868..4e9c310 100644
--- a/recipes-kernel/linux/linux-aspeed_git.bb
+++ b/recipes-kernel/linux/linux-aspeed_git.bb
@@ -1,6 +1,6 @@
 KBRANCH ?= "dev-5.4"
-LINUX_VERSION ?= "5.4.21"
+LINUX_VERSION ?= "5.4.23"
 
-SRCREV="3589f2ee8207e6fdc8c0633b1965dd280a536282"
+SRCREV="6ba708687433a7b9e72093495721e461c8908d37"
 
 require linux-aspeed.inc