[v4.2-branch] Bluetooth: Controller: nRF51x: Use BT_LL_SW_LLCP_LEGACY#98248

Draft

cvinayak wants to merge 14 commits intozephyrproject-rtos:v4.2-branchfrom

cvinayak:github_zephyr_v4_2_branch_nrf51

Commits on Oct 25, 2025

Revert "Bluetooth: controller: remove refs to LLCP_LEGACY after rebase"
cvinayak
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Revert "Bluetooth: controller: remove dependency for slot reservation"
cvinayak
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Revert "Bluetooth: controller: remove code related to advanced scheduling"
cvinayak
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Revert "Blueotooth: controller: removed delayed notification code"
cvinayak
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Revert "Bluetooth: controller: removing legacy LLCP code"
cvinayak
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Revert "Bluetooth: Controller: Remove legacy BT_CTLR_FAST_ENC option"
cvinayak
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Revert "Bluetooth: Controller: Porting legacy Accept CIS procedure"
cvinayak
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Revert "Bluetooth: Controller: Porting legacy llcp procedure"
cvinayak
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Bluetooth: Controller: Use reference conn event count in CPR
cvinayak
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Bluetooth: Controller: Updates to win_offset_calc
cvinayak
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Bluetooth: Controller: Re-grouping conn updates of same interval
cvinayak
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tests: bsim: Bluetooth: Add test for auto connection parameter update
cvinayak
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Bluetooth: Controller: nRF51x: Use BT_LL_SW_LLCP_LEGACY
cvinayak
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Bluetooth: Controller: nRF51x: Enable Privacy Support
cvinayak
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