Using `COUNTER_2_NAME` when all other properties are
`COUNTER_TIMER2_foo` is confusing. Make the names consistent.
Signed-off-by: Peter A. Bigot <pab@pabigot.com>
RTC1 (not RTC0) is excluded because it is used as the system clock.
Also document that TIMER0 and RTC0 may be rejected when CONFIG_BT_LL_SW
is enabled.
Signed-off-by: Peter A. Bigot <pab@pabigot.com>
