[roll] Roll fuchsia [spi][amlogic] Add an option for the client to pre-reverse buffers

Allow clients to reverse the endianness of buffers used for DMA
transfers. This is an optimization for the Nelson radar driver which
already does this, meaning the buffers had to be reversed back before
being passed to the radar driver.

Original-Bug: b/216348080
Original-Bug: 95139
Test: fx test aml-spi-test
Test: Used a scope to verify the endianness for DMA and PIO transfers on
      vim3
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/683036
Original-Revision: 6a95e2a3974c0e53effa0da0a5989a4ba092144b
GitOrigin-RevId: 62f8edce8424b9a33ba02162c17f67f8a822a6e1
Change-Id: I3ca4b1f418394440225432ba1d65abadbe5d783f
diff --git a/stem b/stem
index 5019b3c..2ee6018 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
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-             revision="31858e4724e39fdca1f0a9b1823b1517f4ef77ac"/>
+             revision="6a95e2a3974c0e53effa0da0a5989a4ba092144b"/>
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