fix(cot-dt2c): fix various breakages

This change fixes several breakages that were introduced in some build
configurations by the introduction of the cot-dt2c tool.

Some Python environments cannot be managed directly via `pip`, and
invocations of `make`, including `make distclean`, would cause errors
along the lines of:

    error: externally-managed-environment

    × This environment is externally managed
    ╰─> To install Python packages system-wide, try apt install
        python3-xyz, where xyz is the package you are trying to
        install.

This change has been resolved by ensuring that calls to the cot-dt2c
tool from the build system happen exclusively through Poetry, which
automatically sets up a virtual environment that *can* be modified.

Some environments saw the following error when building platforms where
the cot-dt2c tool was used:

    make: *** No rule to make target '<..>/debug/bl2_cot.c', needed
    by '<..>/debug/bl2/bl2_cot.o'.  Stop.

Additionally, environments with a more recent version of Python saw the
following error:

      File "<...>/lib/python3.12/site-packages/cot_dt2c/cot_parser.py",
      line 637, in img_to_c
        if ifdef:
           ^^^^^
    NameError: name 'ifdef' is not defined

Both of these errors have now been resolved by modifications to the
build system and the cot-dt2c tool to enable preprocessing of the device
tree source file before it is processed by the tool.

As a consequence of this change, the `pydevicetree` library is no longer
vendored into the repository tree, and we instead pull it in via a
dependency in Poetry.

This change also resolves several MyPy warnings and errors related to
missing type hints.

Change-Id: I72b2d01caca3fcb789d3fe2549f318a9c92d77d1
Signed-off-by: Chris Kay <chris.kay@arm.com>
diff --git a/pyproject.toml b/pyproject.toml
index 03d898e..f0b3925 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,7 @@
 
 [tool.poetry.dependencies]
 python = "^3.8"
+cot-dt2c = {path = "tools/cot_dt2c", develop = true}
 tlc = {path = "tools/tlc"}
 
 [tool.poetry.group.docs]