[nrf noup] samples/smp_svr: Increase stack size required

Increase stack size as support for SHA512 requires more data.

Signed-off-by: Dominik Ermel <[email protected]>
(cherry picked from commit 0efc441)

Author: de-nordic

samples/subsys/mgmt/mcumgr/smp_svr/prj.conf

@@ -8,7 +8,7 @@ CONFIG_FLASH_MAP=y
 
 # Some command handlers require a large stack.
 CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2304
-CONFIG_MAIN_STACK_SIZE=2048
+CONFIG_MAIN_STACK_SIZE=2176
 
 # Ensure an MCUboot-compatible binary is generated.
 CONFIG_BOOTLOADER_MCUBOOT=y