platform/x86/intel/pmc: use kcalloc() instead of kzalloc()

platform/x86/intel/pmc: use kcalloc() instead of kzalloc()

Replace devm_kzalloc() with devm_kcalloc() in pmc_core_get_tgl_lpm_reqs().
As noted in the kernel documentation [1], open-coded multiplication in
allocator arguments is discouraged because it can lead to integer
overflow.

Using devm_kcalloc() provides built-in overflow protection, making the
memory allocation safer when calculating the allocation size compared
to explicit multiplication.

[1]: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments

Signed-off-by: Qianfeng Rong <rongqianfeng@vivo.com>
Acked-by: David E. Box <david.e.box@intel.com>
Link: https://lore.kernel.org/r/20250819135155.338380-1-rongqianfeng@vivo.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>