CHROMIUM: WAR: ath10k: Disable 5G band channels for WCN3990

wcn3990 is a phy with 2G and 5G capability. But for mistral
it is only 2Ghz capable. hence disable the 5Ghz capability
for wcn3990

BUG=b:132147953
TEST= Run on mistral
      "iw dev wlan-2400mhz survey dump"

Change-Id: I7985033e96d03075b36d3c08aa3e87ca1fb981fb
Signed-off-by: Balaji Pothunoori <bpothuno@codeaurora.org>
Signed-off-by: Vamsi Singamsetty <vamssi@codeaurora.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/1597064


Reviewed-by: Zhihong Yu <zhihongyu@chromium.org>
Reviewed-by: Govind Singh <govinds@qualcomm.corp-partner.google.com>
Commit-Queue: Zhihong Yu <zhihongyu@chromium.org>
Tested-by: Zhihong Yu <zhihongyu@chromium.org>