[roll zephyr] include/net: add the alignment for data in NET_BUF_POOL_FIXED_DEFINE

NET_BUF_POOL_FIXED_DEFINE locates net_buf_data in __noinit section,
it does not guarantees that data buffer will aligned.

There is wifi driver which required network buffers to be aligned.

Changes:
line below (from NET_BUF_POOL_FIXED_DEFINE macro):
 static uint8_t __noinit net_buf_data_##_name[_count][_data_size];
is updated to:
 static uint8_t __noinit net_buf_data_##_name[_count][_data_size]
 __net_buf_align;

https://pigweed.googlesource.com/third_party/github/zephyrproject-rtos/zephyr
zephyr Rolled-Commits: df81fef94483da9..5897de1e5358162
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Change-Id: I41d6d0189c4b1f926720f5172ecacc4ce86b2e3d
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/105361
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diff --git a/zephyr b/zephyr
index df81fef..5897de1 160000
--- a/zephyr
+++ b/zephyr
@@ -1 +1 @@
-Subproject commit df81fef94483da9f2811d48088affbcfd61ab18c
+Subproject commit 5897de1e535816247e309348cbe29760361a28b8