s390/mm: remove dead pfmf inline assembly

void storage_key_init_range(unsigned long start, unsigned long end);

static inline unsigned long pfmf(unsigned long function, unsigned long address)

{

	asm volatile(

		"	.insn	rre,0xb9af0000,%[function],%[address]"

		: [address] "+a" (address)

		: [function] "d" (function)

		: "memory");

	return address;

}

static inline void clear_page(void *page)

{

	register unsigned long reg1 asm ("1") = 0;