Disable i2ctarget on ESP

According to #8520 it was never fully implemented and the IDF API
has changed in 5.2, which we haven't switched to yet.

Author: tannewt

ports/espressif/mpconfigport.mk

@@ -32,7 +32,7 @@ CIRCUITPY_ESPULP ?= 1
 CIRCUITPY_FRAMEBUFFERIO ?= 1
 CIRCUITPY_FREQUENCYIO ?= 1
 CIRCUITPY_HASHLIB ?= 1
-CIRCUITPY_I2CTARGET ?= 1
+CIRCUITPY_I2CTARGET ?= 0
 CIRCUITPY_IMAGECAPTURE = 0
 CIRCUITPY_MEMORYMAP ?= 1
 CIRCUITPY_NVM ?= 1