[DO-NOT-MERGE][test] VPP: verify sub-port fixes with legacy promisc script

Test-only combo branch for Elastictest regression (pipeline 2818,
t1-lag-vpp). This variant keeps the sub-port/warm-arp sairedis changes but
reverts the one-shot VPP API promisc replacement and restores the legacy
vpp_promisc.sh polling mechanism in platform-vpp.

Submodule pointers:
- src/sonic-sairedis -> 01f35553 (lunyue-ms:lunyue/sub-port-fixes)
    sub-port/warm-arp changes kept; 6c8bbf47 promisc API commit removed
- platform/vpp       -> f1e0c8a (lunyue-ms:test/restore-vpp-promisc-for-27630)
    based on ce80ca0 plus vpp_promisc.sh/conf restored for docker-syncd-vpp
    and docker-sonic-vpp

Local validation on vms-kvm-vpp-t1-lag:
- combo with 6c8bbf47: arp/test_neighbor_mac.py 8/12 errors
- this revert-promisc-script image: arp/test_neighbor_mac.py 0/12 errors

.gitmodules URLs for these two submodules are temporarily pointed at the
lunyue-ms forks so CI can fetch the fork-only commits. Not for merge.

Signed-off-by: Lun Yue <17232861+lunyue-ms@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: lunyue-ms

.gitmodules

@@ -6,7 +6,7 @@
 	url = https://github.com/sonic-net/sonic-linux-kernel
 [submodule "sonic-sairedis"]
 	path = src/sonic-sairedis
-	url = https://github.com/sonic-net/sonic-sairedis
+	url = https://github.com/lunyue-ms/sonic-sairedis
 [submodule "sonic-swss"]
 	path = src/sonic-swss
 	url = https://github.com/sonic-net/sonic-swss
@@ -128,7 +128,7 @@
 	url = https://github.com/Marvell-switching/sonic-platform-marvell.git
 [submodule "platform/vpp"]
 	path = platform/vpp
-	url = https://github.com/sonic-net/sonic-platform-vpp.git
+	url = https://github.com/lunyue-ms/sonic-platform-vpp.git
 [submodule "platform/marvell-prestera/mrvl-prestera"]
 	path = platform/marvell-prestera/mrvl-prestera
 	url = https://github.com/Marvell-switching/mrvl-prestera.git