fix(spinlock): comparison of integer expressions of different signedness (IDFGH-13581)

[Andste82]

developers who do not use idf.py but prefer classic CMake currently receive a lot of warnings because a comparison in the header file spinlock.h is not correct.

comparison of integer expressions of different signedness: 'esp_cpu_cycle_count_t' {aka 'long unsigned int'} and 'int32_t' {aka 'long int'} [-Wsign-compare]

since it is a header, the gcc option -Wall, which is relevant for the application code, unfortunately also applies to all includes.

this fix casts the signed timeout to the corresponding unsigned type esp_cpu_cycle_count_t for a correct comparison.

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