ARM: dts: qcom: apq8064: update Adreno clock names

The legacy clock names (including the _clk suffix) was dropped from the
driver, so update the dts accordingly).

Tested on Nexus 7 2013, no functional changes.

Signed-off-by: David Heidelberg <david@ixit.cz>
[bjorn: Updated commit message]
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210829133918.57780-2-david@ixit.cz