RC Oscilator with SDK 2.8.0

Hello Nordic team,

just received my first hardware and try to port my code which I developed by using the 54L15PDK board with SDK 2.7.0. At the PDK everything did run fine. 

When flashing the code to my hardware it seems that everything works out well, except the BT doesn´t work at all. As I got a hint to use the new 2.8.0 SDK for the latest chip iteration I was about to do so. However, when compiling the code previously developed for the 54L15PDK I get:

opt/nordic/ncs/v2.8.0/zephyr/drivers/timer/nrf_grtc_timer.c: In function 'sys_clock_driver_init':
/opt/nordic/ncs/v2.8.0/zephyr/drivers/timer/nrf_grtc_timer.c:511:36: error: 'NRF_GRTC_CLKSEL_LFLPRC' undeclared (first use in this function); did you mean 'NRF_GRTC_CLKSEL_LFCLK'?
511 | nrfx_grtc_clock_source_set(NRF_GRTC_CLKSEL_LFLPRC);
| ^~~~~~~~~~~~~~~~~~~~~~
| NRF_GRTC_CLKSEL_LFCLK
/opt/nordic/ncs/v2.8.0/zephyr/drivers/timer/nrf_grtc_timer.c:511:36: note: each undeclared identifier is reported only once for each function it appears in

We are using the LFCLK-PINS as GPIO. So I did the following configurations:

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_500PPM=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC_CALIBRATION=y
CONFIG_CLOCK_CONTROL_NRF_CALIBRATION_LF_ALWAYS_ON=y
Any idea what has changed in the 2.8.0 not to work with the internal RC anymore? Is it really required to change to 2.8.0 to get the BT running?
The chip does show the following laser engraving: 54L15, QFAABB, 2435AB 
Well, as usual, any hints are welcome.
Best regards
Frank
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