[libc] Reduce binary size for baremetal targets (#121164)

For `math` functions we must choose size optimized implementations.
Removing framepointers will also help with binary size savings.

libc/config/baremetal/config.json

@@ -25,5 +25,15 @@
     "LIBC_CONF_QSORT_IMPL": {
       "value": "LIBC_QSORT_HEAP_SORT"
     }
+  },
+  "math": {
+    "LIBC_CONF_MATH_OPTIMIZATIONS": {
+      "value": "(LIBC_MATH_SKIP_ACCURATE_PASS | LIBC_MATH_SMALL_TABLES)"
+    }
+  },
+  "codegen": {
+    "LIBC_CONF_KEEP_FRAME_POINTER": {
+      "value": false
+    }
   }
 }