oeqa/manual/bsp-hw.json: fix syntax error

oeqa/manual/bsp-hw.json: fix syntax error

Remove the redundant comma to fix the json decode error:

$ resulttool manualexecution ../meta/lib/oeqa/manual/bsp-hw.json
Traceback (most recent call last):
[snip]
  File "/usr/lib/python3.6/json/decoder.py", line 357, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 948 column 1 (char 39810)

Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>