Revert "armv8: Enable CPUECTLR.SMPEN for coherency"

Upon further review this breaks most other platforms as we need to check
what core we're running on before touching it at all.

This reverts commit d73718f3.
Signed-off-by: NTom Rini <trini@konsulko.com>

arch/arm/cpu/armv8/start.S

@@ -81,14 +81,6 @@ reset:
 	msr	cpacr_el1, x0			/* Enable FP/SIMD */
 0:
 
-	/* Enalbe SMPEN bit for coherency.
-	 * This register is not architectural but at the moment
-	 * this bit should be set for A53/A57/A72.
-	 */
-	mrs     x0, S3_1_c15_c2_1               /* cpuactlr_el1 */
-	orr     x0, x0, #0x40
-	msr     S3_1_c15_c2_1, x0
-
 	/* Apply ARM core specific erratas */
 	bl	apply_core_errata