Adding platform detection opcodes + fix assembler bug.

Adding flags to allow runtime detection of different esp32 models,
riscv vs xtensa, and psram.

Use this to conditionally compile hook for relevant assemblers.

esp32/print-builtins.cpp

@@ -18,6 +18,7 @@
 
 #define SIM_PRINT_ONLY
 #define ENABLE_OLED_SUPPORT
+#include "esp32/platform.h"
 #include "esp32/options.h"
 #define CALLING_OPCODE_LIST
 #define FLOATING_POINT_LIST