soc: silabs_exx32: register 'soc' logger module

'soc' logger module may be used by any SoC related code located in soc/.
An implementation file requiring logger services should include
LOG_MODULE_DECLARE(soc, CONFIG_SOC_LOG_LEVEL);
to use the 'soc' logger instance.

Signed-off-by: Piotr Mienkowski <piotr.mienkowski@gmail.com>

soc/arm/silabs_exx32/common/soc.c

@@ -18,6 +18,10 @@
 #include <arch/cpu.h>
 #include <cortex_m/exc.h>
 
+#include <logging/log.h>
+
+LOG_MODULE_REGISTER(soc, CONFIG_SOC_LOG_LEVEL);
+
 #ifdef CONFIG_CMU_HFCLK_HFXO
 /**
  * @brief Initialization parameters for the external high frequency oscillator