Bluetooth: controller: Fix Kconfig dependencies for PHY options

Fix Kconfig dependencies for enabling the controller PHY options
for LE 2M Phy  and LE Coded Phy. These options should be selectable
without connections enabled when extended advertising has been enabled.

The issue affects out-of-tree controllers that wish to use the
BT_CTLR_PHY_CODED and BT_CTLR_PHY_2M options.

Signed-off-by: Joakim Andersson <joakim.andersson@nordicsemi.no>