ath10k: Increase peer delete response wait to 500msec

Peer creation in firmware fails if last peer deletion is still
in progress. Need to wait for peer delete response from firmware
after deleting peer from host driver.

Increase the peer delete response wait time to 500msec.

CRs-Fixed: 2063832
Change-Id: I1c1c2500ae7f8ff1448f6b726d30dbbe3334957c
Signed-off-by: Rakesh Pillai <pillair@codeaurora.org>