fixup! [builtins] Refactor cpu_model support to reduce #if nesting. NFCI

#75635 (comment)

Author: jroelofs

compiler-rt/lib/builtins/cpu_model/aarch64/lse_atomics/android.inc

@@ -1,7 +1,8 @@
 #include <string.h>
+#include <sys/auxv.h>
 #include <sys/system_properties.h>
 
-static void __isExynos9810(void) {
+static bool __isExynos9810(void) {
   char arch[PROP_VALUE_MAX];
   return __system_property_get("ro.arch", arch) > 0 &&
     strncmp(arch, "exynos9810", sizeof("exynos9810") - 1) == 0;