power: rename residency policy Kconfig options

Rename power managment subsystem Kconfig options describing minimum
residency to make them easier to identify with respective policy.

Following is a detailed list of string replacements used:
s/SYS_PM_SLEEP_(\d)_MIN_RES/SYS_PM_MIN_RESIDENCY_SLEEP_$1/
s/SYS_PM_DEEP_SLEEP_(\d)_MIN_RES/SYS_PM_MIN_RESIDENCY_DEEP_SLEEP_$1/

Signed-off-by: Piotr Mienkowski <piotr.mienkowski@gmail.com>