Coremark: start

Fix --emulator native.

Add baremetal/arch/aarch64/contextidr_el1.c

baremetal/arch/aarch64/contextidr_el1.c

@@ -0,0 +1,10 @@
+/* https://cirosantilli.com/linux-kernel-module-cheat#config-pid-in-contextidr */
+
+#include <inttypes.h>
+
+int main(void) {
+    for (int i = 0; i < 10; i++) {
+        __asm__ ("msr contextidr_el1, %0" : : "r" (i) :);
+    }
+    return 0;
+}