update and cleanup patches for core{pkg, via}temp etc.

[Chen Gong]

[PATCH V2 1/2] hwmon: uniform the init style of pkgtemp
[PATCH V2 2/2] hwmon: cleanup some hotplug related macro definition

These 2 patches don't supply new functions, just unify the codes to avoid
potential issues and some cleanup work.

V2: fix some compile errors.

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