Make totalhigh_pages of consistent type.

[Andreas Fenkart]

Printing the value of totalhigh_pages requires casting, like in
this print message:

arch/x86/mm/init_32.c:
  printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
      "%dk reserved, %dk data, %dk init, %ldk highmem)\n",
    ...
    (unsigned long)(totalhigh_pages << (PAGE_SHIFT-10)));

The need for casting is due to totalhigh_pages being of different
type, when CONFIG_HIGHMEM is set/unset.

include/linux/highmem.h:
  #ifdef CONFIG_HIGHMEM
  
  extern unsigned long totalhigh_pages;
  
  #else /* CONFIG_HIGHMEM */
  
 -#define totalhigh_pages 0
 +#define totalhigh_pages 0UL
  ...

For C files there should be no problem, because 0/0UL are both
valid C and denote the same value. Assembly files are not
affected, since linux/highmem.h can not be included from
assembly.

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