Bluetooth: controller: Compilation error when Encryption support is disabled

[cvinayak]

Describe the bug
tests/bluetooth/mesh_shell for pca10056 it fails to compile with error

/home/user/work/zephyr/subsys/bluetooth/controller/ll_sw/ull_conn.c: In function 'event_conn_upd_prep':
/home/user/work/zephyr/subsys/bluetooth/controller/ll_sw/ull_conn.c:2350:37: error: 'struct <anonymous>' has no member named 'llcp_type'
 2350 |   if (conn->lll.role && (conn->slave.llcp_type != LLCP_NONE)) {
      |                                     ^
/home/user/work/zephyr/subsys/bluetooth/controller/ll_sw/ull_conn.c:2354:15: error: 'struct <anonymous>' has no member named 'llcp_type'
 2354 |    conn->slave.llcp_type = LLCP_NONE;
      |               ^
/home/user/work/zephyr/subsys/bluetooth/controller/ll_sw/ull_conn.c: In function 'event_ch_map_prep':
/home/user/work/zephyr/subsys/bluetooth/controller/ll_sw/ull_conn.c:2634:37: error: 'struct <anonymous>' has no member named 'llcp_type'
 2634 |   if (conn->lll.role && (conn->slave.llcp_type != LLCP_NONE)) {
      |                                     ^
/home/user/work/zephyr/subsys/bluetooth/controller/ll_sw/ull_conn.c:2638:15: error: 'struct <anonymous>' has no member named 'llcp_type'
 2638 |    conn->slave.llcp_type = LLCP_NONE;

This project has encryption disabled and this field is not present. When I enabled enc BT_CTLR_LE_ENC it compiled.

Also, building controller only with no encryption has compile errors.

To Reproduce
Steps to reproduce the behavior:

1. mkdir build; cd build
2. cmake -GNinja -DBOARD=nrf52840dk_nrf52840 ../samples/bluetooth/hci_uart
3. make
4. See error

Expected behavior
Application should compile clean.

Impact
showstopper

Logs and console output
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e.g Wireshark capture or Logic analyzer capture (upload in zip archive).
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Environment (please complete the following information):

• OS: Linux
• Toolchain Zephyr SDK
• Commit SHA or Version used: fc03bd2

Additional context
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