soc/arm: power: Leftover from pm hooks conversion to __weak

In commit "pm: Fix weak linkage symbols" (PR #35274),
PM SoC hooks were converted to __weak to avoid clash with
new definition of these symbols in subsys/pm/power.c.

In this process, few SoCs were missed.
Fix this.

#37226

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>