Bluetooth: Controller: df: Fix check for max CTE num to sample or adv

Maximum number of CTE to be send in a periodic advertising chain is
limited by BT 5.3 Vol 4 Part E, section 7.8.80 and is 16.
Maximum number of samples CTE in a periodic advertising chain is
limited by BT 5.3 Vol 4 Part E, section 7.8.82 and is also 16.
Both values are limited by amount of memory reserved in Controller
by Kcofigs, respectfully: CONFIG_BT_CTLR_DF_PER_ADV_CTE_NUM_MAX and
CONFIG_BT_CTLR_DF_PER_SCAN_CTE_NUM_MAX.

Functions ll_df_set_cl_cte_tx_params and ll_df_set_cl_iq_sampling_enable
check limits against Bluetooth specification provided values.
That can end with memory overwrite if number of requested CTEs is
greater that number provided in configuration.

The commit changes mentioned functions to validate HCI commands
parameters against configuration values.

Signed-off-by: Piotr Pryga <piotr.pryga@nordicsemi.no>