simplify barrier to wait for additional cores

src/arch/aarch64/kernel/start.rs

@@ -39,9 +39,9 @@ pub unsafe extern "C" fn _start(boot_info: Option<&'static RawBootInfo>, cpu_id:
 			"mrs x4, mpidr_el1",
 			"and x4, x4, #0xff",
 			"1:",
-			"adrp x8, {cpu_online}",
-			"ldr x5, [x8, #:lo12:{cpu_online}]",
-			"cmp x4, x5",
+			"adr x8, {cpu_online}",
+			"ldr x8, [x8]",
+			"cmp x4, x8",
 			"b.eq 2f",
 			"b 1b",
 			"2:",