s390/mm: remove unused get_page_state() function

Remove unused get_page_state() function:

arch/s390/mm/page-states.c:61:29:
  error: unused function 'get_page_state' [-Werror,-Wunused-function]
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

arch/s390/mm/page-states.c

@@ -58,17 +58,6 @@ void __init cmma_init(void)
 		cmma_flag = 2;
 }
 
-static inline unsigned char get_page_state(struct page *page)
-{
-	unsigned char state;
-
-	asm volatile("	.insn	rrf,0xb9ab0000,%0,%1,%2,0"
-		     : "=&d" (state)
-		     : "a" (page_to_phys(page)),
-		       "i" (ESSA_GET_STATE));
-	return state & 0x3f;
-}
-
 static inline void set_page_unused(struct page *page, int order)
 {
 	int i, rc;