Revert "[nrf noup] samples: mgmt: mcumgr: smp_svr: Add nrf5340dk-optimised sample"

This reverts commit d2ca243.

Signed-off-by: Jamie McCrae <[email protected]>

Author: nordicjm

samples/subsys/mgmt/mcumgr/smp_svr/app_nrf5340_bt.overlay

@@ -192,11 +192,3 @@ tests:
       - nrf52840dk/nrf52840
     integration_platforms:
       - nrf52840dk/nrf52840
-  sample.mcumgr.smp_svr.bt.nrf5340dk.ext_flash:
-    sysbuild: true
-    extra_args:
-      - FILE_SUFFIX=nrf5340_bt
-    platform_allow:
-      - nrf5340dk/nrf5340/cpuapp
-    integration_platforms:
-      - nrf5340dk/nrf5340/cpuapp