[nrf noup] tests: bluetooth: tester: Increment peripheral count value

This is needed for privacy tests. Specifically, this fixes
GAP/PRIV/CONN/BV-10-C and GAP/CONN/UCON/BV-06-C on nRF54H20.

Signed-off-by: Pavel Vasilyev <[email protected]>

Author: PavelVPV

tests/bluetooth/tester/hci_ipc_cpunet.conf

@@ -15,3 +15,5 @@ CONFIG_BT_CTLR_ADV_ISO_STREAM_MAX=4
 
 CONFIG_BT_CTLR_ISOAL_SOURCES=4
 CONFIG_BT_CTLR_ISO_TX_BUFFERS=8
+
+CONFIG_BT_CTLR_SDC_PERIPHERAL_COUNT=2