bluetooth: controller: openisa/RV32M1: BLE Link Layer ULL/LLL split

This commit takes the Nordic LLL and adapts it for RV32M1 SoCs, using
the blocks that are specific to this SoC: the GenFSK & LPTMR IP
blocks.

Signed-off-by: George Stefan <george.stefan@nxp.com>
Signed-off-by: Radu Alexe <radu.alexe@nxp.com>
Signed-off-by: Ionut Ursescu <ionut.ursescu@nxp.com>