Get rid of PCI register size map

kernel/pci/qemu_pci_serial/qemu_pci_serial.c

@@ -158,14 +158,13 @@ void pci_qemu_pci_serial_init(void) {
     return;
   }
   
-  uint32_t bar0 = pci_read(dev, PCI_BAR0);
+  uint32_t bar0 = pci_read32(dev, PCI_BAR0);
 
   LOG("pci", "QEMU_PCI_SERIAL bar0=0x%x\n", bar0);
   
   uint16_t iobase = bar0 & 0xFFFFFFFC;
   LOG("pci", "QEMU_PCI_SERIAL iobase=0x%x\n", iobase);
 
-  QEMU_PCI_SERIAL_DEV._magic = QEMU_PCI_SERIAL_MAGIC;
   QEMU_PCI_SERIAL_DEV.iobase = iobase;
   QEMU_PCI_SERIAL_DEV.lockstate = -1;
 

kernel/pci/qemu_pci_serial/qemu_pci_serial.h

@@ -4,10 +4,7 @@
 #include <stdint.h>
 #include <stddef.h>
 
-#define QEMU_PCI_SERIAL_MAGIC 0x1234
-
 typedef struct {
-  uint32_t _magic;
   uint16_t iobase;
   int lockstate;
 } QemuPciSerialDev;