generate_profile error: "XLRDError: Excel xlsx file not supported"

[polyvertex]

FIT SDK now comes with Profile.xlsx (previously Profile.xls) so tools/generate_profile.py needs to be updated (using openpyxl?).

As a workaround, it is possible to manually convert Profile.xlsx to the old format and pass it generate_profile directly.

Caution with that though since the resulting profile.py will not contain SDK's version number in its header.