ARM: dts: qcom: ipq4019: remove clk-output-names for sleep clock

Now that sleep clock is being passed directly to GCC, there is no need for
global name matching, so remove clk-output-names for sleep clock.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230214162325.312057-4-robert.marko@sartura.hr