Bluetooth: controller: Increase RX prio stack size
Bluetooth: controller: Increase RX prio stack size

Due to several changes in the way stacks are calculated, 320 bytes is no
longer enough for the controller-only build. After measuring usages of
up to 320 bytes (locally) and 376 (reported by Ricardo Salveti), the
stack size is increased by 128 bytes, up to 448 bytes.

Signed-off-by: Carles Cufi <853081dc8dca4fe6a7e3c984752718b5db36e060@nordicsemi.no>

sharronliu/zephyr,zephyrproject-rtos/zephyr,fractalclone/zephyr-riscv,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,holtmann/zephyr,nashif/zephyr,fbsder/zephyr,fractalclone/zephyr-riscv,zephyriot/zephyr,runchip/zephyr-cc3220,nashif/zephyr,rsalveti/zephyr,fbsder/zephyr,fractalclone/zephyr-riscv,finikorg/zephyr,runchip/zephyr-cc3220,galak/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,explora26/zephyr,pklazy/zephyr,ldts/zephyr,pklazy/zephyr,kraj/zephyr,mbolivar/zephyr,Vudentz/zephyr,pklazy/zephyr,holtmann/zephyr,finikorg/zephyr,finikorg/zephyr,kraj/zephyr,Vudentz/zephyr,galak/zephyr,punitvara/zephyr,fractalclone/zephyr-riscv,finikorg/zephyr,ldts/zephyr,fbsder/zephyr,aceofall/zephyr-iotos,holtmann/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,GiulianoFranchetto/zephyr,fractalclone/zephyr-riscv,mbolivar/zephyr,sharronliu/zephyr,finikorg/zephyr,zephyriot/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,kraj/zephyr,aceofall/zephyr-iotos,sharronliu/zephyr,kraj/zephyr,kraj/zephyr,Vudentz/zephyr,mbolivar/zephyr,aceofall/zephyr-iotos,zephyriot/zephyr,explora26/zephyr,ldts/zephyr,rsalveti/zephyr,nashif/zephyr,explora26/zephyr,explora26/zephyr,fbsder/zephyr,rsalveti/zephyr,pklazy/zephyr,rsalveti/zephyr,runchip/zephyr-cc3220,mbolivar/zephyr,ldts/zephyr,holtmann/zephyr,sharronliu/zephyr,fbsder/zephyr,punitvara/zephyr,mbolivar/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,explora26/zephyr,Vudentz/zephyr,galak/zephyr,runchip/zephyr-cc3220,runchip/zephyr-cc3220,rsalveti/zephyr,zephyriot/zephyr,nashif/zephyr,holtmann/zephyr,sharronliu/zephyr,pklazy/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,aceofall/zephyr-iotos,zephyriot/zephyr,Vudentz/zephyr,aceofall/zephyr-iotos