feat(build): support aligned embedded binary data

Allow callers to align embedded binary start symbols for DMA-capable
assets.

tools/cmake/scripts/data_file_embed_asm.cmake

@@ -74,6 +74,9 @@ append_line(".data")
 append_line("#if !defined (__APPLE__) && !defined (__linux__)")
 append_line(".section .rodata.embedded")
 append_line("#endif")
+if(DEFINED DATA_ALIGNMENT)
+    append_line(".balign ${DATA_ALIGNMENT}")
+endif()
 make_and_append_identifier("${varname}")
 make_and_append_identifier("_binary_${varname}_start" "for objcopy compatibility")
 append("${data}")