bluetooth: controller: openisa/RV32M1: enable the BLE SW controller

This patch updates the config files required to enable the
BLE SW defined controller to be built on RV32M1 SoCs. Only the split
version is supported.

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>