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imx8: the mpid should not contain other bits from MPIDR_EL1, only the AFF bits

By looking at ATF, it seems only the affinity bits are
expected here, no MT bit.

--- a/sys/src/9/imx8/main.c

+++ b/sys/src/9/imx8/main.c

@@ -268,7 +268,7 @@

 		cachedwbinvse(MACHP(i), MACHSIZE);

 		u.r0 = 0x84000003;	/* CPU_ON */

-		u.r1 = (sysrd(MPIDR_EL1) & ~MPIDMASK) | machmpid(i);

+		u.r1 = machmpid(i);

 		u.r2 = PADDR(_start);

 		u.r3 = i;

 		smccall(&u);