linux-aspeed: Update to 4.18.7 stable tree

This updates the tree to include the fixes from 4.18.6 and 4.18.7.

Change-Id: I8ad1e035a546022d139fa4a2160cdc8d3a218b81
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 a7957ab..285dd6d 100644
--- a/recipes-kernel/linux/linux-aspeed_git.bb
+++ b/recipes-kernel/linux/linux-aspeed_git.bb
@@ -1,7 +1,6 @@
 KBRANCH ?= "dev-4.18"
-LINUX_VERSION ?= "4.18.5"
+LINUX_VERSION ?= "4.18.7"
 
-
-SRCREV="f749fdd01c481411e626647a8737e0d7f57be9ee"
+SRCREV="b7ba2a0af62b835fb3cac7bd3bbc72dcb1955b65"
 
 require linux-aspeed.inc