[202205] address multiple linux-kernel submodule entries issue (#11765)

Signed-off-by: Ying Xie <ying.xie@microsoft.com>

.gitmodules

@@ -5,6 +5,7 @@
 [submodule "sonic-linux-kernel"]
 	path = src/sonic-linux-kernel
 	url = https://github.com/Azure/sonic-linux-kernel
+    branch = 202205
 [submodule "sonic-sairedis"]
 	path = src/sonic-sairedis
 	url = https://github.com/Azure/sonic-sairedis
@@ -35,10 +36,6 @@
 	path = src/sonic-utilities
 	url = https://github.com/Azure/sonic-utilities
     branch = 202205
-[submodule "src/sonic-linux-kernel"]
-	path = src/sonic-linux-kernel
-	url = https://github.com/sonic-net/sonic-linux-kernel
-    branch = 202205
 [submodule "platform/broadcom/sonic-platform-modules-arista"]
 	path = platform/broadcom/sonic-platform-modules-arista
 	url = https://github.com/aristanetworks/sonic