Bluetooth: controller: Fix ticker implementation to avoid catch up

[cvinayak]

Describe the bug
Relates to #22926

Temporarily ticker compatibility mode has been enabled for nRF5 platforms.

Two issues observed:

1. Either flash driver's ticker instance or master role ticker instance do not get scheduled. Both have an interval of 7.5 ms.
2. Flash erase takes 80 ms during which CPU is halted, master intervals try catch up consuming CPU time that cause master events not being scheduled at hard real time deadlines.

Detailed analysis to be posted here, post v2.2 release completes.

To Reproduce
Steps to reproduce the behavior:

1. mkdir build; cd build
2. cmake -DBOARD=board_xyz
3. make
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Impact
What impact does this issue have on your progress (e.g., annoyance, showstopper)

Screenshots or console output
If applicable, add a screenshot (drag-and-drop an image), or console logs
(cut-and-paste text and put a code fence (```) before and after, to help
explain the issue.

Environment (please complete the following information):

• OS: (e.g. Linux, MacOS, Windows)
• Toolchain (e.g Zephyr SDK, ...)
• Commit SHA or Version used

Additional context
Add any other context about the problem here.

[cvinayak]

Fixed by #23815