qcacld-2.0: Fix incorrect frame length of encrypted auth frame

STA is not able to connect to AP configured with WEP shared
due to incorrect frame length of encrypted auth frame.

Fix this by using the correct frame length.

Bug: 67754642
Change-Id: I4066139487ed56d4bccf46c03f9113505d9e8927
Signed-off-by: Srinivas Girigowda <sgirigow@codeaurora.org>