CI fails because warning in LOG_ERR() in drivers/i2s_ll_stm32.c

The i2s_ll_stm32 driver makes use of LOG_ERR with a wrong argument type:

   LOG_ERR("%s: err=%d", __func__, LL_I2S_ReadReg(cfg->i2s, SR));

Infact, the LL_I2S_ReadReg() function returns uint32_t, while %d requires 'int' as a type.
As a consequence, the compiler returns a warning which is finally mapped to error during
Continuos Integration (CI) tests.