Expose raw data from decoder om Mock BPA decode eid

[jeronstone]

BSL/src/mock_bpa/decode.c

Lines 105 to 109 in 046549e

	BSL_Data_t *raw = &(obj->ssp.as_raw);
	ASSERT_ARG_NONNULL(raw);
	BSL_Data_Init(raw);
	// FIXME expose this from the decoder
	BSL_Data_CopyFrom(raw, end - begin, (const uint8_t *)buf.ptr + begin);

[BrianSipos]

@jeronstone Is this issue still relevant? What does "expose" mean for this issue?