Retrieve appflags from app.elf and use it for derivation

[nroggeman-ledger]

The goal of this PR is to be able to support retrieving appflags from app.elf and use it for derivation.

It is linked to https://ledgerhq.atlassian.net/browse/B2CA-2435

Related PRs:

• Put also app-flags in app.elf to be retrievable by Speculos ledger-secure-sdk#1344
• Add ledger.app_flags section extraction from app.elf ledgered#60

[iartemov-ledger]

1st round, as it is late evening.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 11.40351% with 101 lines in your changes missing coverage. Please review.
✅ Project coverage is 40.71%. Comparing base (9042e33) to head (ff54461).

Files with missing lines	Patch %	Lines
src/bolos/os_bip32.c	17.54%	45 Missing and 2 partials ⚠️
speculos/main.py	0.00%	35 Missing ⚠️
src/launcher.c	0.00%	19 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #618      +/-   ##
==========================================
- Coverage   40.94%   40.71%   -0.23%     
==========================================
  Files         132      132              
  Lines       14106    14215     +109     
  Branches     1256     1275      +19     
==========================================
+ Hits         5775     5787      +12     
- Misses       7951     8046      +95     
- Partials      380      382       +2     

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[iartemov-ledger]

Works for BTC !

I'd real like to have the real exception value for the wrong path checking, 0x4212 in this case. Why to wait a new PR. We're not obliged to change everything, but can correct values gradually.

[iartemov-ledger]

I've tested:

• attempt to derive at root-level without HAVE_APPLICATION_FLAG_DERIVE_MASTER (future test_get_extended_pubkey_non_standard BTC test)
• attempt to BIP32 derivation with a path different from PATH_APP_LOAD_PARAMS (future test_get_extended_pubkey_non_standard BTC test)
• attempt to SLIP21 derivation with a path different from PATH_SLIP21_APP_LOAD_PARAMS (an app modification is required)
• attempt to use a curve different from CURVE_APP_LOAD_PARAMS (an app modification is required)