[submodule] Advance submodule head for sonic-swss and sonic-utilities

sonic-swss:
[Dynamic buffer calc]  Support dynamic buffer calculation (sonic-net#1338)
[dvs] Clean-up dvs_database and dvs_common (sonic-net#1541)
[VxlanMgr] changes for EVPN VXLAN (sonic-net#1266)
Statistics support for Tx and Rx counters of different frame sizes (sonic-net#1536)
[orchagent/phy]: Add firmware info propagation (sonic-net#1540)
[vxlanorch] Use PRI instead of %l to avoid warnings in 32-bit arch (sonic-net#1539)
[FDBSYNCD] Added support for EVPN as described in the PR sonic-net/SONiC#437 (sonic-net#1276)
[everflow] Add retry mechanism for mirror sessions and policers (sonic-net#1486)
Enable ACL table type  mirror_v6 for Innovium Platform (sonic-net#1527)
[fgnhgorch] Change format specifier %lu to %zu for size_t (sonic-net#1529)
[dvs] Fix issue where concurrent netns operations cause test setup to fail (sonic-net#1535)
Add support for headroom pool watermark (sonic-net#1453)
Change gAsicInstance to type string with max length limit (sonic-net#1526)

sonic-utilities:
[Dynamic buffer calc] Support dynamic buffer calculation (sonic-net#973)
show tech with platform dump option (sonic-net#1158)
[kdump]: Parse sonic_platform kernel command line parameter to read the platform identifier string (sonic-net#1291)
[pcieutil] Remove 'pcie-' prefix from arguments (sonic-net#1297)
Added 'detailed' option for 'show interface counters' command (sonic-net#1299)
Fix show ip route summary on pizzabox platforms (sonic-net#1302)
[acl_loader] Fix default DENY rule for V6 dataplane ACLs (sonic-net#1281)
Add show and clear commands for headroom pool watermark  (sonic-net#1144)
[unit test][CLI][pfcwd] Added pfcwd config tests for single and multi ASIC platform. (sonic-net#1248)
[sflow] Fix traceback seen for show sflow interface (sonic-net#1282)
[config/console][consutil] Support enable/disable console switch (sonic-net#1275)
[fast-reboot] Fix fast-reboot when NDP entries are present (sonic-net#1295)
Fast-reboot: add a new flag to ignore ASIC config checksum verification failures (sonic-net#1292)
Kdump improvements (sonic-net#1284)

Signed-off-by: Stephen Sun <stephens@nvidia.com>