fastmodel: Fix scx_get_parameter_list for ARM fastmodels.

The first non-critical piece of this CL removes the unused self
from the Python function signature.

Then also includes "stl.h" from pybind11 to allow the
implicit conversion from std::map<std::string, std::string>
to a Python dict (otherwise there will be a runtime (not compile time)
error when calling the function.

As the current implementation always throws an error because of the
missing stl.h I don't believe anyone is using this function, and as such
it should be safe to just change the signature of
scx_get_parameter_list.

Change-Id: Ib3202b2d4d1b8418a4adf54739fe389d4ee07743
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/45622
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/arch/arm/fastmodel/arm_fast_model.py

@@ -77,7 +77,7 @@ def scx_get_parameter(name):
     _m5.arm_fast_model.scx_get_parameter(name, value)
     return value
 
-def scx_get_parameter_list(self):
+def scx_get_parameter_list():
     return _m5.arm_fast_model.scx_get_parameter_list()
 
 def scx_set_cpi_file(cpi_file_path):

src/python/pybind11/pybind.hh

@@ -39,6 +39,7 @@
 #define __PYTHON_PYBIND11_PYBIND_HH__
 
 #include "pybind11/pybind11.h"
+#include "pybind11/stl.h"
 
 void pybind_init_core(pybind11::module_ &m_native);
 void pybind_init_debug(pybind11::module_ &m_native);