[PARISC] Remove obsolete _hlt cruft

Remove a bunch of obsolete code from process.c, these routines were
likely imported from the i386 version of process.c when the port
started. The routines are only used in floppy.c, which I seriously
doubt will ever work on parisc, due to architectural assumptions.
Signed-off-by: NKyle McMartin <kyle@parisc-linux.org>

arch/parisc/kernel/process.c

@@ -54,28 +54,12 @@
 #include <asm/uaccess.h>
 #include <asm/unwind.h>
 
-static int hlt_counter __read_mostly;
-
 /*
  * Power off function, if any
  */ 
 void (*pm_power_off)(void);
 EXPORT_SYMBOL(pm_power_off);
 
-void disable_hlt(void)
-{
-	hlt_counter++;
-}
-
-EXPORT_SYMBOL(disable_hlt);
-
-void enable_hlt(void)
-{
-	hlt_counter--;
-}
-
-EXPORT_SYMBOL(enable_hlt);
-
 void default_idle(void)
 {
 	barrier();