ipq806x: remove scm firmware clocks

At the moment as a workaround definition for scm firmware in DT is used as if it is
apq8064 board. This leads to incomplete scm firmware initialization and as a result
cpuidle driver fails to configure.

By design unlike other qcom boards ipq do not use clocks to connect to scm.

Considering this we're removing from DT and scm driver clocks for ipq boards.

As a result cpuidle does not produce errors about failed configuration anymore.

Signed-off-by: Pavel Kubelun <be.dissent@gmail.com>