Fix hybrid MBR recognition on --android-dump

Android parses the output of 'sgdisk --android-dump <blockdev>'
to detect the partition table of external storage devices (SD
cards, USB storage devices, etc.) This function exclusive to
Android's fork of sgdisk is missing a switch case handling
devices that use hybrid MBR as their partitioning scheme.

In Linux, devices using hybrid MBR are handled by simply
ignoring the MBR table, and using GPT. Android should do the
same.

This commit fixes external storage devices formatted with
hybrid GPT being treated by Android as unknown.

Change-Id: I7a06e1f24674e7566edc834b95e4e1898e28ea75
diff --git a/sgdisk.cc b/sgdisk.cc
index 1892e2d..bdd077b 100644
--- a/sgdisk.cc
+++ b/sgdisk.cc
@@ -58,6 +58,7 @@
             }
         }
         break;
+    case hybrid:
     case gpt:
         gptData.JustLooking();
         if (!gptData.LoadPartitions((string) device)) {