ana_cmpr_set_internal_reference() function

- ESP_OK Set denounce configuration success - ESP_ERR_INVALID_ARG NULL pointer of the parameters - ESP_ERR_INVALID_STATE The reference source is not `ANA_CMPR_REF_SRC_INTERNAL`

This function only need to be called when `ana_cmpr_config_t::ref_src` is ANA_CMPR_REF_SRC_INTERNAL. This function is allowed to run within ISR context including intr callbacks This function will be placed into IRAM if `CONFIG_ANA_CMPR_CTRL_FUNC_IN_IRAM` is on, so that it's allowed to be executed when Cache is disabled