staging: rtl8192e: rename bdHTCapLen to bd_ht_cap_len in bss_ht struct

Rename bdHTCapLen to bd_ht_cap_len to silence a checkpatch warning about
CamelCase.

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: William Durand <will+git@drnd.me>
Link: https://lore.kernel.org/r/20210220172909.15812-5-will+git@drnd.me
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>