Nuke the never-functional iriver ifp-7xx port

It never worked, and hasn't compiled in something like a decade, Given
the HW capabilities (limited onboard flash, no expandability) there's
really no point in trying to fix/complete it.

Change-Id: I7d175089840396f8891645bd10010d730dd5bfdc

gdb/Makefile

@@ -7,7 +7,7 @@
 # $Id$
 #
 
-ifeq ($(MODELNAME),ifp7xx)
+ifeq ($(MODELNAME),EXAMPLE)
 
 INCLUDES= -I$(FIRMDIR)/include -I$(FIRMDIR)/export -I. -I$(OBJDIR)	\
  -I$(BUILDDIR)

gdb/arm-stub.c

@@ -21,9 +21,7 @@
 
 #include <stdbool.h>
 #include <string.h>
-#include "ifp_usb_serial.h"
 #include "sscanf.h"
-#include "pnx0101.h"
 #include "gdb_api.h"
 
 #define BUFMAX 1024

gdb/linker.cfg

@@ -8,7 +8,7 @@ OUTPUT_FORMAT(elf32-littlearm)
 #error "Unsupported CPU!"
 #endif
 
-#ifdef IRIVER_IFP7XX_SERIES
+#ifdef EXAMPLE
 MEMORY
 {
    IRAM : ORIGIN = 0, LENGTH = 0x10000