arm64: dts: qcom: Fix WiFi supplies on sc7180-idp

The WiFi supplies that were added recently can't have done anything
useful because they were missing the "-supply" suffix.  Booting
without the "-supply" suffix would give these messages:

ath10k_snoc 18800000.wifi: 18800000.wifi supply vdd-0.8-cx-mx not found, using dummy regulator
ath10k_snoc 18800000.wifi: 18800000.wifi supply vdd-1.8-xo not found, using dummy regulator
ath10k_snoc 18800000.wifi: 18800000.wifi supply vdd-1.3-rfa not found, using dummy regulator
ath10k_snoc 18800000.wifi: 18800000.wifi supply vdd-3.3-ch0 not found, using dummy regulator

Let's add the "-supply" suffix.

Tested-by: Rakesh Pillai <pillair@codeaurora.org>
Reviewed-by: Rakesh Pillai <pillair@codeaurora.org>
Fixes: 1e7594a3 ("arm64: dts: qcom: sc7180: Add WCN3990 WLAN module device node")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20200625131658.REPOST.1.I32960cd32bb84d6db4127c906d7e371fa29caebf@changeid


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>