Bluetooth: Controller: Add support for HCI_LE_CIS_Established event V2

[Copilot]

Bluetooth Core 6.0 introduced HCI_LE_CIS_Established [v2] event (0x2a) with six additional parameters for CIS peripherals: Sub_Interval, Max_SDU_C_To_P, Max_SDU_P_To_C, SDU_Interval_C_To_P, SDU_Interval_P_To_C, and Framing.

Changes

• Event version selection: Controller checks BT_EVT_MASK_LE_CIS_ESTABLISHED_V2 to determine which event version to generate
• V2 event generation: Populates additional fields from existing controller state (lll_cis->sub_interval, cis->c_max_sdu, cis->p_max_sdu, cig->c_sdu_interval, cig->p_sdu_interval, cis->framed)
• Backward compatibility: Falls back to V1 event when V2 is not masked by host

Implementation

Modified le_cis_established() in subsys/bluetooth/controller/hci/hci.c:

/* Check if host supports v2 event */
use_v2 = (le_event_mask & BT_EVT_MASK_LE_CIS_ESTABLISHED_V2) != 0;

if (use_v2) {
    sep_v2 = meta_evt(buf, BT_HCI_EVT_LE_CIS_ESTABLISHED_V2, sizeof(*sep_v2));
    // ... populate V1 fields ...
    
    /* V2-specific fields */
    sys_put_le24(lll_cis->sub_interval, sep_v2->sub_interval);
    sep_v2->c_max_sdu = sys_cpu_to_le16(cis->c_max_sdu);
    sep_v2->p_max_sdu = sys_cpu_to_le16(cis->p_max_sdu);
    sys_put_le24(cig->c_sdu_interval, sep_v2->c_sdu_interval);
    sys_put_le24(cig->p_sdu_interval, sep_v2->p_sdu_interval);
    sep_v2->framing = cis->framed;
} else {
    // Generate V1 event
}

All V2 fields sourced from existing internal structures; no changes to data collection paths required.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Bluetooth: Controller: ISO: Add support for CIS established event V2</issue_title>
<issue_description>Is your enhancement proposal related to a problem? Please describe.
Bluetooth Core 6.0 added a new version of the HCI_LE_CIS_Established event which adds additional information to the CIS peripheral when a CIS is connected, such as the Sub_Interval, Max_SDU_C_To_P, Max_SDU_P_To_C, SDU_Interval_C_To_P, SDU_Interval_P_To_C, and Framing.

Describe the solution you'd like
Add support for generate and sending the event to the host.

Describe alternatives you've consideredN/A

Additional context
Since not all hosts may support this new event, it needs to be ensured that the right event is sent. See also zephyrproject-rtos#79554
</issue_description>

<agent_instructions>Refer to BLUETOOTH CORE SPECIFICATION Version 6.2 | Vol 4, Part E, Section 7.7.65.25
LE CIS Established event, and implement the generation of HCI_LE_CIS_Established [v2] event in the Zephyr Project open source Bluetooth Low Energy Controller implementation. Take inspiration of how existing HCI_LE_CIS_Established [v1] is implemented and correctly fill accordingly the event parameters required for the HCI_LE_CIS_Established [v2] event.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Bluetooth: Controller: ISO: Add support for CIS established event V2 zephyrproject-rtos/zephyr#79555

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