ath10k: skip sending default IE in scan request added by firmware

Supported rates and extended supported rates are added in probe
request automatically by firmware. The IE sent by host in the scan
request command is appended to this. If host also sends supported
and extended supported rates IE, then these IEs are duplicated in
the probe requests.

Skip sending the supported rates and extended supported rates IEs
in the start scan command for wcn3990.

CRs-Fixed: 2093804
Change-Id: I9afe85a3602a3935557894ed8c6e1af8cb47967d
Signed-off-by: Rakesh Pillai <pillair@codeaurora.org>