drivers: soc: qcom: Remove prints from the idle path

The system runs into a "undefined instruction" error when first core waking
out of power collapse tries to wakeup a core by writing to a GIC register.
When waking out of reset, the GIC SRE bit is reset, and any accesses to the
GIC ICC registers would result in a "undefined instructions". When a first
waking out of reset writes to a console, the console task is now marked as
unnable by the scheduler. If the console task is running on a different
CPU, this would trigger a IRQ_WORK IPI to the target CPU. Since the core is
waking out of reset, its SRE bit is cleared and any access to the GIC ICC
registers results in an undefined instruction abort.

Fix by removing logging from the idle path.

Change-Id: I476d4a4d082bb115128e1f54c931558e79fec567
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>