Various fixes and improvements for the I2S PRs by endolith

decoder/test/i2s/2ch-32bit-8khz-no-samplerate.bin_wav

@@ -1,4 +1,4 @@
-0-0 i2s: 52 49 46 46 24 80 00 00 57 41 56 45 66 6d 74 20 10 00 00 00 01 00 02 00 80 3e 00 00 00 fa 00 00 04 00 20 00 64 61 74 61 ff ff ff ff
+0-0 i2s: 52 49 46 46 24 80 00 00 57 41 56 45 66 6d 74 20 10 00 00 00 01 00 02 00 80 3e 00 00 00 f4 01 00 08 00 20 00 64 61 74 61 ff ff ff ff
 307-1057 i2s: 00 00 78 f6
 1057-1807 i2s: 00 00 fd ff
 1807-2557 i2s: 00 00 b8 f4

decoder/test/i2s/2ch-32bit-8khz.bin_wav

@@ -1,4 +1,4 @@
-0-0 i2s: 52 49 46 46 24 80 00 00 57 41 56 45 66 6d 74 20 10 00 00 00 01 00 02 00 80 3e 00 00 00 fa 00 00 04 00 20 00 64 61 74 61 ff ff ff ff
+0-0 i2s: 52 49 46 46 24 80 00 00 57 41 56 45 66 6d 74 20 10 00 00 00 01 00 02 00 80 3e 00 00 00 f4 01 00 08 00 20 00 64 61 74 61 ff ff ff ff
 307-1057 i2s: 00 00 78 f6
 1057-1807 i2s: 00 00 fd ff
 1807-2557 i2s: 00 00 b8 f4

decoder/test/i2s/2ch-incomplete-first-sample.bin_wav

@@ -0,0 +1,210 @@
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