x86/nmi: Use a macro to initialize NMI descriptors

x86/nmi: Use a macro to initialize NMI descriptors

The NMI descriptors for each NMI type are stored in an array. However,
they are currently initialized using raw numbers, which makes it
difficult to understand the code.

Introduce a macro to initialize the NMI descriptors using the NMI type
enum values to make the code more readable.

No functional change intended.

Signed-off-by: Sohil Mehta <sohil.mehta@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Nikolay Borisov <nik.borisov@suse.com>
Link: https://lore.kernel.org/r/20250327234629.3953536-4-sohil.mehta@intel.com