nimble/phy: Add syscfg for variable tifs
This was removed accidentally when migrating to nrf5x phy.
#
syscfg.defs:
+ BLE_PHY_VARIABLE_TIFS:
+ description: >
+ Enables API to set custom T_ifs (inter-frame spacing) for each
+ transition. T_ifs is reset to default value after each transition.
+ When disabled, 150us is always used which enables some build-time
+ optimizations by compiler.
+ experimental: 1
+ value: 0
+
BLE_PHY_SYSVIEW:
description: >
Enable SystemView tracing module for radio driver.
