hwmon: coretemp: use dynamically allocated array to store per core data

[Lukasz Odzioba]

This patch is continuation of my previous work. After Guenter Roeck's and Jean Delware's comments I changed list to an array. Initial array size is 4 and it is extended when core id exeeds size of the array, which in practice can mean every time a new core is initialized. I am not sure whether it is reasonable since it implies a lot of krealloc calls with small size increments. Please let me know if you think that more greedy approach would be better here. 

Comments are welcome.


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