linux-aspeed: Move to v6.6.21 stable release

Apply the upstream security and bug fixes.

Change-Id: I58377d95c785b98a5e72b83c5a67b872d1246225
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
diff --git a/meta-aspeed/recipes-kernel/linux/linux-aspeed_git.bb b/meta-aspeed/recipes-kernel/linux/linux-aspeed_git.bb
index 4a8e8f8..56bf646 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-6.6"
-LINUX_VERSION ?= "6.6.20"
+LINUX_VERSION ?= "6.6.21"
 
-SRCREV="07346b9af263ce3b7f3de6943c742cb5e65ed08f"
+SRCREV="816ffd28002651a469e86d1118a225862e392ecd"
 
 require linux-aspeed.inc