Rename "struct partition" to "struct part_geom"

Change-Id: Ifaf9795ba70f5b933599b2a6ec9415e6bd13200c

include/minix/blockdriver.h

@@ -23,7 +23,7 @@ struct blockdriver {
 	  cp_grant_id_t grant);
   void(*bdr_cleanup) (void);
   struct device *(*bdr_part)(dev_t minor);
-  void(*bdr_geometry) (dev_t minor, struct partition *part);
+  void(*bdr_geometry) (dev_t minor, struct part_geom *part);
   void(*bdr_intr) (unsigned int irqs);
   void(*bdr_alarm) (clock_t stamp);
   int(*bdr_other) (message *m_ptr);

include/minix/partition.h

@@ -12,7 +12,7 @@
 
 int minix_sizeup(char *name, u64_t *bytes);
 
-struct partition {
+struct part_geom {
   u64_t base;		/* byte offset to the partition start */
   u64_t size;		/* number of bytes in the partition */
   unsigned cylinders;	/* disk geometry */