m68k: sun3: Make print_pte() static

When building with W=1:

    arch/m68k/sun3/mmu_emu.c:70:6: warning: no previous prototype for ‘print_pte’ [-Wmissing-prototypes]
       70 | void print_pte (pte_t pte)
	  |      ^~~~~~~~~

Fix this by making print_pte() static.
There was never a user outside arch/m68k/sun3/mmu_emu.c.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/a56c70e85584efb3681cb7e94aff167299dfa5e4.1694613528.git.geert@linux-m68k.org

Author: geertu

arch/m68k/sun3/mmu_emu.c

@@ -67,7 +67,7 @@ static unsigned char ctx_avail = CONTEXTS_NUM-1;
 unsigned long rom_pages[256];
 
 /* Print a PTE value in symbolic form. For debugging. */
-void print_pte (pte_t pte)
+static void print_pte(pte_t pte)
 {
 #if 0
 	/* Verbose version. */