sh64: Kill off special clear_page() implementation.

This can use the now generic clear_page() implementation, which is backed
by the sh64 optimized memset routine. This also fixes up the case where
PAGE_SIZE != 4kB.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/sh_ksyms_64.c

@@ -52,7 +52,6 @@ EXPORT_SYMBOL(__get_user_asm_l);
 EXPORT_SYMBOL(__get_user_asm_q);
 EXPORT_SYMBOL(__strnlen_user);
 EXPORT_SYMBOL(__strncpy_from_user);
-EXPORT_SYMBOL(clear_page);
 EXPORT_SYMBOL(__clear_user);
 EXPORT_SYMBOL(copy_page);
 EXPORT_SYMBOL(__copy_user);