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/esp32/esp32.cmake b/boot/espressif/hal/include/esp32/esp32.cmake
new file mode 100644
index 0000000..ab96d1d
--- /dev/null
+++ b/boot/espressif/hal/include/esp32/esp32.cmake
@@ -0,0 +1,3 @@
+list(APPEND LINKER_SCRIPTS
+    -T${esp_idf_dir}/components/esp_rom/${MCUBOOT_TARGET}/ld/${MCUBOOT_TARGET}.rom.newlib-funcs.ld
+    )