bluetooth: kconfig: disable some options for openisa/RV32M1

Some Bluetooth options are currently not supported by the experimental
BLE SW LL implementation done on VEGABoard. As such, hide them from
the user altogether.

The full list of disabled config options is as follows:

- CONFIG_BT_PHY_UPDATE
- CONFIG_BT_DATA_LEN_UPDATE
- CONFIG_BT_HCI_VS
- CONFIG_BT_CTLR_LE_ENC
- CONFIG_BT_CTLR_CONN_PARAM_REQ
- CONFIG_BT_CTLR_EXT_REJ_IND
- CONFIG_BT_CTLR_SLAVE_FEAT_REQ
- CONFIG_BT_CTLR_LE_PING
- CONFIG_BT_CTLR_PRIVACY
- CONFIG_BT_CTLR_EXT_SCAN_FP
- CONFIG_BT_CTLR_CHAN_SEL_2
- CONFIG_BT_CTLR_ADV_EXT
- CONFIG_BT_CTLR_XTAL_ADVANCED
- CONFIG_BT_CTLR_SCHED_ADVANCED
- CONFIG_BT_CTLR_TIFS_HW

Signed-off-by: Alex Porosanu <alexandru.porosanu@nxp.com>