Add forgotted files for C3_USB build

Author: Michael O'Cleirigh

boards/esp32/MICROLITE_C3_USB/custom-partitions.csv

@@ -0,0 +1,10 @@
+# Notes: the offset of the partition table itself is set in
+# $ESPIDF/components/partition_table/Kconfig.projbuild and the
+# offset of the factory/ota_0 partition is set in makeimg.py
+# I needed to increase the size of the app partition to fit the tensorflow microlite library
+# There is 1/2 as much data partition as with standard micropython on esp32 4MiB.
+# Name,   Type, SubType, Offset,  Size, Flags
+nvs,      data, nvs,     0x9000,  0x6000,
+phy_init, data, phy,     0xf000,  0x1000,
+factory,  app,  factory, 0x10000, 0x280000,
+vfs,      data, fat,     0x300000, 0x100000,

boards/esp32/MICROLITE_C3_USB/sdkconfig.partition

@@ -0,0 +1,21 @@
+# -- from GENERIC_C3_USB start --
+
+CONFIG_ESP32C3_REV_MIN_3=y
+CONFIG_ESP32C3_REV_MIN=3
+CONFIG_ESP32C3_BROWNOUT_DET=y
+CONFIG_ESP32C3_BROWNOUT_DET_LVL_SEL_7=
+CONFIG_ESP32C3_BROWNOUT_DET_LVL_SEL_4=y
+CONFIG_ESP32C3_BROWNOUT_DET_LVL=4
+CONFIG_ESP_CONSOLE_UART_DEFAULT=
+CONFIG_ESP_CONSOLE_USB_CDC=
+CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG=y
+
+# -- from GENERIC_C3_USB end --
+
+# MICROLITE 4M flash partition adjustment
+#CONFIG_ESPTOOLPY_FLASHMODE_DIO=y
+#CONFIG_ESPTOOLPY_FLASHFREQ_40M=y
+#CONFIG_ESPTOOLPY_FLASHSIZE_2MB=y
+CONFIG_PARTITION_TABLE_CUSTOM=y
+# move back up from micropython/ports/esp32 to the main project source code
+CONFIG_PARTITION_TABLE_CUSTOM_FILENAME="../../../boards/esp32/MICROLITE_C3_USB/custom-partitions.csv"