drivers: clock_control: Clock calibtration with alt driver

With this change it is possible to share all configurations
related to CLOCK_CONTROL_NRF_K32SRC_RC_CALIBRATION without
including the clock calibration configurations.

Signed-off-by: Rubin Gerritsen <rubin.gerritsen@nordicsemi.no>
Signed-off-by: Joakim Andersson <joakim.andersson@nordicsemi.no>