[submodules] set submodule branches

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

.gitmodules

@@ -1,15 +1,18 @@
 [submodule "sonic-swss-common"]
 	path = src/sonic-swss-common
 	url = https://github.com/Azure/sonic-swss-common
+    branch = 202205
 [submodule "sonic-linux-kernel"]
 	path = src/sonic-linux-kernel
 	url = https://github.com/Azure/sonic-linux-kernel
 [submodule "sonic-sairedis"]
 	path = src/sonic-sairedis
 	url = https://github.com/Azure/sonic-sairedis
+    branch = 202205
 [submodule "sonic-swss"]
 	path = src/sonic-swss
 	url = https://github.com/Azure/sonic-swss
+    branch = 202205
 [submodule "src/p4c-bm/p4c-bm"]
 	path = platform/p4/p4c-bm/p4c-bm
 	url = https://github.com/krambn/p4c-bm
@@ -31,15 +34,18 @@
 [submodule "src/sonic-utilities"]
 	path = src/sonic-utilities
 	url = https://github.com/Azure/sonic-utilities
+    branch = 202205
 [submodule "platform/broadcom/sonic-platform-modules-arista"]
 	path = platform/broadcom/sonic-platform-modules-arista
 	url = https://github.com/aristanetworks/sonic
 [submodule "src/sonic-platform-common"]
 	path = src/sonic-platform-common
 	url = https://github.com/Azure/sonic-platform-common
+    branch = 202205
 [submodule "src/sonic-platform-daemons"]
 	path = src/sonic-platform-daemons
 	url = https://github.com/Azure/sonic-platform-daemons
+    branch = 202205
 [submodule "src/sonic-platform-pde"]
 	path = src/sonic-platform-pde
 	url = https://github.com/Azure/sonic-platform-pdk-pde
@@ -100,6 +106,7 @@
 [submodule "src/linkmgrd"]
 	path = src/linkmgrd
 	url = https://github.com/Azure/sonic-linkmgrd.git
+    branch = 202205
 [submodule "src/sonic-p4rt/sonic-pins"]
 	path = src/sonic-p4rt/sonic-pins
 	url = https://github.com/Azure/sonic-pins.git