[nrf noup] samples: mgmt: mcumgr: smp_svr: Fix nrf5340dk-optimised sample

[nrf-squash!] [nrf noup] samples: mgmt: mcumgr: smp_svr: Add nrf5340dk-optimised sample

Fixes a missing MCUboot configuration for this specific
configuration which did not set the number of MCUboot sectors
properly

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

Author: nordicjm

samples/subsys/mgmt/mcumgr/smp_svr/sysbuild/mcuboot_nrf5340_bt.conf

@@ -0,0 +1 @@
+CONFIG_BOOT_MAX_IMG_SECTORS=220