ulp: Add aditional uint32_t object to `ulp_insn_t`

Used to get the encoded instruction from bit-field structs.

Merges https://github.com/espressif/esp-idf/pull/3759

components/ulp/include/esp32/ulp.h

@@ -293,6 +293,8 @@ typedef union {
         uint32_t opcode: 4;         /*!< Opcode (OPCODE_MACRO) */
     } macro;                        /*!< Format of tokens used by MACROs */
 
+    uint32_t instruction;           /*!< Encoded instruction for ULP coprocessor */
+
 } ulp_insn_t;
 
 _Static_assert(sizeof(ulp_insn_t) == 4, "ULP coprocessor instruction size should be 4 bytes");