ipq40xx: use upstreamed SDI disable support

ipq40xx: use upstreamed SDI disable support

Google WiFi board has what seems as debug version of TZ/QSEE and it is
always enabling SDI (Secure Debug Image) and in order to do a regular
reboot it must be disabled, as otherwise you are stuck in a debug state
where you are supposed to extract debug logs via QCA tooling which is not
helpfull at all for regular users.

So, instead of using our downstream version to disable SDI lets use the
version that was merged upstream and relies on a boolean property in the
SCM node instead of checking the compatible.

Signed-off-by: Robert Marko <robimarko@gmail.com>
Tested-by: Brian Norris <computersforpeace@gmail.com>