Revert "arm64/dts: support channel extension"

This reverts commit be98016a.

Revert this change due to it will cause Wifi calling cannot work normally.

Bug: 197189571
Test: WFC work normally
Signed-off-by: Mars Lin <marslin@google.com>
Change-Id: I621fbf3b44394b74fe175edbc5d46f47622576a7