Allow setting PCI status register

Don't always return 0 when reading it. The status register contains some bits that Open Firmware uses to set some properties.
A PCI device can set a default status register value to set those bits.
	this->status = 0x02B0; // 0000  0 01 0  1 0 1 1  0000 Capabilities List, 66 MHz, Fast Back-to-Back, DevSel Speed: Medium

devices/common/pci/pcidevice.cpp

@@ -33,7 +33,7 @@ PCIDevice::PCIDevice(std::string name)
 {
     this->pci_name = name;
 
-    this->pci_rd_stat       = []() { return 0; };
+    this->pci_rd_stat       = [this]() { return this->status; };
     this->pci_rd_cmd        = [this]() { return this->command; };
     this->pci_rd_bist       = []() { return 0; };
     this->pci_rd_lat_timer  = [this]() { return this->lat_timer; };