brcmfmac: initialize the requested dwell time

Commit 4905432b28b7 ("brcmfmac: Fix P2P Group Formation failure via Go-neg
method") did not initialize requested_dwell properly, resulting in an
always-false dwell time overflow check. Fix it by setting the correct
requested_dwell value.

Fixes: 4905432b28b7 ("brcmfmac: Fix P2P Group Formation failure via Go-neg method")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Joseph Chuang <joseph.chuang@cypress.com>
Signed-off-by: Chi-Hsien Lin <chi-hsien.lin@cypress.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200610152106.175257-7-chi-hsien.lin@cypress.com