Update:

It seems AFTER one or more (not yet sure how many
are needed) successful suspend & resume
cycles brcmsmac actually works. Pretty interesting,
because usually wlan drivers stop working after supend...

Attached is the dmesg output of a currently working
system!

Let me know whether we can debug this issue somehow
/ you need more information to do so.

Cheers,

Nico

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PGP key: 7ED9 F7D3 6B10 81D7 0EC5  5C09 D7DC C8E4 3187 7DF0