Bluetooth: Controller: Fix minimal Kconfig depends and defaults

Fix default value of BT_TICKER_REMAINDER_GET, it will be
selected based on enabled Controller features. This is not
needed by minimal peripheral role.

Fix depends on for BT_CTLR_CONN_RANDOM_FORCE as it is
applicable when more than one simultaneous connections is
supported. Again, this is not needed by minimal peripheral
role.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>