s390/sigp: use register pair instead of register asm

static inline int ____pcpu_sigp(u16 addr, u8 order, unsigned long parm,

				u32 *status)

{

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

	union register_pair r1 = { .odd = parm, };

	int cc;

	asm volatile(

		"	sigp	%1,%2,0(%3)\n"

		"	ipm	%0\n"

		"	srl	%0,28\n"

		: "=d" (cc), "+d" (reg1) : "d" (addr), "a" (order) : "cc");

	*status = reg1;

		"	sigp	%[r1],%[addr],0(%[order])\n"

		"	ipm	%[cc]\n"

		"	srl	%[cc],28\n"

		: [cc] "=&d" (cc), [r1] "+&d" (r1.pair)

		: [addr] "d" (addr), [order] "a" (order)

		: "cc");

	*status = r1.even;

	return cc;

}