Bluetooth: controller: openisa: Fix sanitycheck failures

Fix sanitycheck failures when building
samples/bluetooth/peripheral_hr for rv32m1_vega_ri5cy
platform.

Updates from nRF platform related to 255 byte AD data
support have been directly copied into openisa port to
fix build failures.

Relates to commit c2fc629d ("Bluetooth: controller:
255 byte AD payload support").

Fixes #29967.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>