nimble/ll: Fix DTM build without 2M/Coded PHY enabled
nimble/ll: Fix DTM build without 2M/Coded PHY enabled

Error: repos/apache-mynewt-core/net/nimble/controller/src/ble_ll_dtm.c:
In function 'ble_ll_dtm_tx_sched_cb':
repos/apache-mynewt-core/net/nimble/controller/src/ble_ll_dtm.c:187:5:
error: implicit declaration of function 'ble_phy_mode_set'; did you mean
'ble_phy_reset'? [-Werror=implicit-function-declaration]
     ble_phy_mode_set(ctx->phy_mode, ctx->phy_mode);
     ^~~~~~~~~~~~~~~~
     ble_phy_reset
repos/apache-mynewt-core/net/nimble/controller/src/ble_ll_dtm.c: In
function 'ble_ll_dtm_ctx_free':
repos/apache-mynewt-core/net/nimble/controller/src/ble_ll_dtm.c:346:5:
error: implicit declaration of function 'ble_ll_xcvr_rfclk_stop'; did
you mean 'ble_ll_sched_stop'? [-Werror=implicit-function-declaration]
     ble_ll_xcvr_rfclk_stop();
     ^~~~~~~~~~~~~~~~~~~~~~
     ble_ll_sched_stop
cc1: all warnings being treated as errors

andrzej-kaczmarek/incubator-mynewt-core,andrzej-kaczmarek/apache-mynewt-core,andrzej-kaczmarek/incubator-mynewt-core,andrzej-kaczmarek/incubator-mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,andrzej-kaczmarek/apache-mynewt-core,mlaz/mynewt-core,andrzej-kaczmarek/apache-mynewt-core,andrzej-kaczmarek/incubator-mynewt-core,mlaz/mynewt-core,andrzej-kaczmarek/incubator-mynewt-core,mlaz/mynewt-core,andrzej-kaczmarek/apache-mynewt-core