Alternative fix for "espulp module broken in CircuitPython 9"

[Sola85]

This is an alternative to PR #9277. In that PR, this issue in the esp-idf was circumvented by disabling one of the ULPs for every type of esp32.
Here, instead we copy one file (namely ports/espressif/bindings/espulp/ulp_riscv.c) from the esp-idf into the circuitpython repo, in order to make the necessary functions for the riscv ulp available at compile time (as suggested by @tannewt here).
This allows both the FSM and RISCV ulps to be included simultaneously in circuitpython for ESP32S2/S3 despite the above issue in esp-idf.

We also have to define CONFIG_ULP_COPROC_TYPE_RISCV manually based on which CONFIG_IDF_TARGET_ESP32XX is set.

Since I'm not sure whether copying a file from esp-idf into the circuitpython repo is acceptable for the maintainers, I have created a separate PR for this commit.

Here is a small proof of concept, showing that the RISCV ULP works again, after this PR

import espulp
import memorymap
import time
# simple counting example, increments a variable once per ulp wakeup
binary = b"\x6f\x00\xe0\x01\x13\x00\x00\x00\x13\x00\x00\x00\x13\x00\x00\x00\x82\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x17\x11\x00\x00\x13\x01\x21\xfe\x19\x28\x19\x20\x1d\x20\x01\xa0\x83\x27\x40\x07\x01\x45\x85\x07\x23\x2a\xf0\x06\x82\x80\xa1\x67\x93\x87\x47\x10\x98\x43\xb7\x06\xc0\xfd\xfd\x16\x75\x8f\x98\xc3\x82\x80\xa1\x67\x93\x87\x47\x10\x98\x43\xb7\x46\xc0\xff\xfd\x16\x75\x8f\xb7\xc6\x0f\x00\x55\x8f\x98\xc3\x98\x43\xb7\x06\x40\x02\x55\x8f\x98\xc3\x01\xa0"

variable = memorymap.AddressRange(start=0x50000074, length=4)

ulp = espulp.ULP(espulp.Architecture.RISCV)
ulp.halt()
ulp.set_wakeup_period(0, 100000)
ulp.run(binary)

print()
while True:
    time.sleep(1)
    print("Value from RISC-V ULP:", int.from_bytes(variable[:], "little"))

[bill88t]

Circuitpython has it's own fork of idf.
https://github.com/adafruit/esp-idf

[Sola85]

Ah, good to know. Then I will propose a change enabling the use both ulps simultaneously in that repo instead!