target: add Espressif ESP32 basic support

ESP32 is a dual core Xtensa SoC
Not full featured yet. Some of the missing functionality:
-Semihosting
-Flash breakpoints
-Flash loader
-Apptrace
-FreeRTOS

Signed-off-by: Erhan Kurubas <erhan.kurubas@espressif.com>
Change-Id: I76fb184aa38ab9f4e30290c038b5ff8850060750
Reviewed-on: https://review.openocd.org/c/openocd/+/6989
Tested-by: jenkins
Reviewed-by: Ian Thompson <ianst@cadence.com>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

src/target/espressif/esp32s2.c

@@ -474,7 +474,7 @@ static int esp32s2_soc_reset(struct target *target)
 	res = esp32s2_set_peri_reg_mask(target,
 		ESP32_S2_OPTIONS0,
 		ESP32_S2_SW_SYS_RST_M,
-		1U << ESP32_S2_SW_SYS_RST_S);
+		BIT(ESP32_S2_SW_SYS_RST_S));
 	xtensa->suppress_dsr_errors = false;
 	if (res != ERROR_OK) {
 		LOG_ERROR("Failed to write ESP32_S2_OPTIONS0 (%d)!", res);