[U-Boot] [PATCH 10/53] binman: Adjust state.fdt_files to be keyed by entry type

[sjg at google.com]

It makes more sense to use entry type as the key for this dictionary,
since the filename can in principle be anything. Make this change and also
rename fdt_files and add a comment to explain it better.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 tools/binman/etype/blob_dtb.py              |  4 +-
 tools/binman/etype/u_boot_dtb_with_ucode.py |  6 +--
 tools/binman/state.py                       | 57 ++++++++++++---------
 3 files changed, 38 insertions(+), 29 deletions(-)

Applied to u-boot-dm, thanks!