espressif: Add ESP32-C3 initial basic support

ESP32-C3 target added to the Espressif port, CMakeLists, and
added related files to ESP32-C3 target directory as well.

Signed-off-by: Almir Okato <almir.okato@espressif.com>
diff --git a/boot/espressif/hal/include/esp32c3/esp32c3.cmake b/boot/espressif/hal/include/esp32c3/esp32c3.cmake
new file mode 100644
index 0000000..372f4a4
--- /dev/null
+++ b/boot/espressif/hal/include/esp32c3/esp32c3.cmake
@@ -0,0 +1,13 @@
+list(APPEND hal_srcs
+    ${esp_idf_dir}/components/bootloader_support/src/flash_qio_mode.c
+    ${esp_idf_dir}/components/esp_hw_support/port/${MCUBOOT_TARGET}/cpu_util_esp32c3.c
+)
+
+list(APPEND LINKER_SCRIPTS
+    -T${esp_idf_dir}/components/esp_rom/${MCUBOOT_TARGET}/ld/${MCUBOOT_TARGET}.rom.newlib.ld
+)
+
+set_source_files_properties(
+    ${esp_idf_dir}/components/bootloader_support/src/flash_qio_mode.c
+    PROPERTIES COMPILE_FLAGS
+    "-Wno-unused-variable")