Bluetooth: shell: allow multiple parameters for bt hci-cmd
Bluetooth: shell: allow multiple parameters for bt hci-cmd

The hci-cmd currently accepts only a 1 byte parameter. This
disables use of commands that requires more than 1 byte,
for ex. the feature exchange that requires a 16 bit parameter.

This commit allows a datafield parameter up to 65 bytes long.
65 bytes comes from the nr. of parameters for the
HCI_LE_Generate_DHKey command

Signed-off-by: Andries Kruithof <51b9e94fd9719f930d9278e9897457f29ad12e15@nordicsemi.no>

Vudentz/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,Vudentz/zephyr,finikorg/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,Vudentz/zephyr,Vudentz/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,nashif/zephyr,finikorg/zephyr,nashif/zephyr,Vudentz/zephyr,galak/zephyr,nashif/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr