Add simple NVMe module and switch to NVMe emulation

src/kernel/util.h

@@ -22,6 +22,16 @@ static inline void outw(uint16_t port, uint16_t value) {
   __asm__ volatile("outw %0, %1" : : "a"(value), "Nd"(port));
 }
 
+static inline uint32_t inl(uint16_t port) {
+  uint32_t value;
+  __asm__ volatile("inl %1, %0" : "=a"(value) : "Nd"(port));
+  return value;
+}
+
+static inline void outl(uint16_t port, uint32_t value) {
+  __asm__ volatile("outl %0, %1" : : "a"(value), "Nd"(port));
+}
+
 static inline void insw(uint16_t port, void *to, uint32_t count) {
   __asm__ volatile("rep insw" : "=D"(to), "=c"(count) : "d"(port), "D"(to), "c"(count) : "memory");
 }