tests: bluetooth: tester: Enable BT_TINYCRYPT_ECC for nRF5340

This needs to be enabled in nRF53 CPUAPP for LE SC support to be
enabled.

Signed-off-by: Szymon Janc <szymon.janc@codecoup.pl>

Author: sjanc

tests/bluetooth/tester/boards/nrf5340dk_nrf5340_cpuapp.conf

@@ -21,3 +21,5 @@ CONFIG_LOG_DEFAULT_LEVEL=3
 CONFIG_BTTESTER_LOG_LEVEL_DBG=y
 
 CONFIG_UART_INTERRUPT_DRIVEN=y
+
+CONFIG_BT_TINYCRYPT_ECC=y