Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/Documentation/sound/alsa-configuration.rst b/Documentation/sound/alsa-configuration.rst
index 4a3cecc..02aacd6 100644
--- a/Documentation/sound/alsa-configuration.rst
+++ b/Documentation/sound/alsa-configuration.rst
@@ -1001,6 +1001,8 @@
     2 = POSBUF: use position buffer,
     3 = VIACOMBO: VIA-specific workaround for capture,
     4 = COMBO: use LPIB for playback, auto for capture stream
+    5 = SKL+: apply the delay calculation available on recent Intel chips
+    6 = FIFO: correct the position with the fixed FIFO size, for recent AMD chips
 probe_mask
     Bitmask to probe codecs (default = -1, meaning all slots);
     When the bit 8 (0x100) is set, the lower 8 bits are used