s390/sysinfo: get rid of register asm

static inline int __stsi(void *sysinfo, int fc, int sel1, int sel2, int *lvl)

{

	register int r0 asm("0") = (fc << 28) | sel1;

	register int r1 asm("1") = sel2;

	int r0 = (fc << 28) | sel1;

	int rc = 0;

	asm volatile(

		"	stsi	0(%3)\n"

		"	lr	0,%[r0]\n"

		"	lr	1,%[r1]\n"

		"	stsi	0(%[sysinfo])\n"

		"0:	jz	2f\n"

		"1:	lhi	%1,%4\n"

		"2:\n"

		"1:	lhi	%[rc],%[retval]\n"

		"2:	lr	%[r0],0\n"

		EX_TABLE(0b, 1b)

		: "+d" (r0), "+d" (rc)

		: "d" (r1), "a" (sysinfo), "K" (-EOPNOTSUPP)

		: "cc", "memory");

		: [r0] "+d" (r0), [rc] "+d" (rc)

		: [r1] "d" (sel2),

		  [sysinfo] "a" (sysinfo),

		  [retval] "K" (-EOPNOTSUPP)

		: "cc", "0", "1", "memory");

	*lvl = ((unsigned int) r0) >> 28;

	return rc;

}