Fix nvme_disk on non-x86

[kallisti5]

nvme_disk has some type-size assertions which are failing on non-x86. Fix nvme_disk to function across all supported architectures.

C++ objects/haiku/arm/release/add-ons/kernel/drivers/disk/nvme/libnvme_haiku.o 
In file included from ../haiku/src/add-ons/kernel/drivers/disk/nvme/compat/libnvme_haiku.cpp:16:
../haiku/src/add-ons/kernel/drivers/disk/nvme/compat/libnvme_haiku.cpp: In function 'phys_addr_t nvme_mem_vtophys(void*)':
../haiku/src/add-ons/kernel/drivers/disk/nvme/compat/nvme_mem.h:25:29: warning: conversion from 'long long unsigned int' to 'phys_addr_t' {aka 'unsigned int'} changes value from '18446744073709551615' to '4294967295' [-Woverflow]
 #define NVME_VTOPHYS_ERROR (~0ULL)
                            ~^~~~~~
../haiku/src/add-ons/kernel/drivers/disk/nvme/compat/libnvme_haiku.cpp:88:10: note: in expansion of macro 'NVME_VTOPHYS_ERROR'
   return NVME_VTOPHYS_ERROR;
          ^~~~~~~~~~~~~~~~~~
Cc objects/haiku/arm/release/add-ons/kernel/drivers/disk/nvme/nvme.o 
In file included from ../haiku/src/add-ons/kernel/drivers/disk/nvme/libnvme/nvme.h:54,
                 from ../haiku/src/add-ons/kernel/drivers/disk/nvme/libnvme/nvme_common.h:60,
                 from ../haiku/src/add-ons/kernel/drivers/disk/nvme/libnvme/nvme_internal.h:37,
                 from ../haiku/src/add-ons/kernel/drivers/disk/nvme/libnvme/nvme.c:34:
../haiku/src/add-ons/kernel/drivers/disk/nvme/libnvme/nvme_spec.h:79:39: error: static assertion failed: "nvme_tracker is not 4K"
 #define nvme_static_assert(cond, msg) _Static_assert(cond, msg)
                                       ^~~~~~~~~~~~~~
../haiku/src/add-ons/kernel/drivers/disk/nvme/libnvme/nvme_internal.h:336:1: note: in expansion of macro 'nvme_static_assert'
 nvme_static_assert(sizeof(struct nvme_tracker) == 4096,
 ^~~~~~~~~~~~~~~~~~