[nrf fromlist] modules: hal_nordic: nrfx: switch off auto clksel for GRTC

Disable automatic LFCLK selection for GRTC during driver initialization.
For Zephyr applications it is selected by `sys_clock_driver_init()`
depending on configuration and DTS.

Upstream PR #: 87199

Signed-off-by: Adam Kondraciuk <[email protected]>

Author: adamkondraciuk

modules/hal_nordic/nrfx/nrfx_kconfig.h

@@ -170,6 +170,7 @@
 
 #ifdef CONFIG_NRF_GRTC_TIMER_CLOCK_MANAGEMENT
 #define NRF_GRTC_HAS_EXTENDED 1
+#define NRFX_GRTC_CONFIG_LFCLK_SELECT_AT_INIT 0
 #endif
 #ifdef CONFIG_NRF_GRTC_TIMER_AUTO_KEEP_ALIVE
 #define NRFX_GRTC_CONFIG_AUTOEN 1