[kernel]: update sonic linux kernel submodule

lguohan · lguohan · commit a32b7412c38c · 2018-08-11T09:09:03.000Z
* 70fdaa2 2018-06-30 | Support Delta DPS1900 (#49) (HEAD -> stretch, origin/stretch) [Deni] * 77895c5 2018-04-17 | Add kexec reboot string (#46) [Joe LeVeque]
diff --git a/src/sonic-linux-kernel b/src/sonic-linux-kernel
@@ -1 +1 @@
-Subproject commit a21a592baf4b189591f63fe7930f7d889bccd57a
+Subproject commit 70fdaa224c1373682be871c084bf0f590bfafd8f
