tools: p2a: check aspeed bridge

Check whether the pci-to-ahb bridge is enabled.  It should be enabled
because this comes after the firmware blob is opened for writing.

Tested: Verified it reports the correct state of the value.
Change-Id: I04bd21fdbf65938164f5845c0ec46e2231b17bd9
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/tools/pci.hpp b/tools/pci.hpp
index 96f1ea4..37cd736 100644
--- a/tools/pci.hpp
+++ b/tools/pci.hpp
@@ -18,11 +18,12 @@
  */
 struct PciDevice
 {
-    int vid;
-    int did;
-    int bus;
-    int dev;
-    int func;
+    std::uint16_t vid;
+    std::uint16_t did;
+    std::uint8_t bus;
+    std::uint8_t dev;
+    std::uint8_t func;
+    pciaddr_t bars[6];
 };
 
 /**
@@ -31,8 +32,8 @@
  */
 struct PciFilter
 {
-    int vid;
-    int did;
+    std::uint16_t vid;
+    std::uint16_t did;
 };
 
 class PciUtilInterface