Fix narrowing conversion in metal header

[wenbinlyuTT]

Ticket

N/A

Problem description

Compiling an external metal cpp program with clang++-17 fails with the following error

.../tt_metal/api/tt-metalium/dispatch_settings.hpp:82:59: error: non-constant-expression cannot be narrowed from type 'int' to 'uint32_t' (aka 'unsigned int') in initializer list [-Wc++11-narrowing]
   82 |                 DispatchSettingsContainerKey k{core_type, hw_cqs};
      |                                                           ^~~~~~

What's changed

Changed the loop variable to be u32, also removed one unused header.

Checklist

• All post commit CI passes