Use correct PCI register base address for newer Radeon chips

* Radeon chips since Bonaire use a different PCI register base
  address. Select the correct one depending on chipset generation
  (values from Linux driver).

* Makes radeon_hd work for newer APUs/GPUs (tested with Kabini APU).

src/add-ons/kernel/drivers/graphics/radeon_hd/radeon_hd.cpp

@@ -517,6 +517,16 @@ radeon_hd_getbios_avivo(radeon_info &info)
 }
 
 
+static uint32
+radeon_hd_pci_bar_mmio(uint16 chipsetID)
+{
+	if (chipsetID < RADEON_BONAIRE)
+		return 2;
+	else
+		return 5;
+}
+
+
 status_t
 radeon_hd_init(radeon_info &info)
 {
@@ -542,9 +552,10 @@ radeon_hd_init(radeon_info &info)
 
 	// *** Map Memory mapped IO
 	AreaKeeper mmioMapper;
+	const uint32 pciBarMmio = radeon_hd_pci_bar_mmio(info.chipsetID);
 	info.registers_area = mmioMapper.Map("radeon hd mmio",
-		info.pci->u.h0.base_registers[PCI_BAR_MMIO],
-		info.pci->u.h0.base_register_sizes[PCI_BAR_MMIO],
+		info.pci->u.h0.base_registers[pciBarMmio],
+		info.pci->u.h0.base_register_sizes[pciBarMmio],
 		B_ANY_KERNEL_ADDRESS, B_KERNEL_READ_AREA | B_KERNEL_WRITE_AREA,
 		(void**)&info.registers);
 	if (mmioMapper.InitCheck() < B_OK) {

src/add-ons/kernel/drivers/graphics/radeon_hd/radeon_hd_private.h

@@ -21,7 +21,6 @@
 
 // PCI Base Address Registers
 #define PCI_BAR_FB      0
-#define PCI_BAR_MMIO    2
 
 #define RADEON_BIOS8(adr, v) 	(adr[v])
 #define RADEON_BIOS16(adr, v) 	((adr[v]) | (adr[(v) + 1] << 8))