New Device: Add support for ZoeRax HG0402XG V1.1

The ZoeRax HG0402XG is an unmanaged 4 2.5GBit Ethernet, 2 SFP+
device.

doc/devices/ZOERAX_HG0402XG_V1.1.md

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+### HG0402XG V1.1
+
+## Brands
+|Brand|Type|Managed|PCB|Flash|Chip RTL|
+|---|---|---|---|---|---|
+| ZoeRax | HG0402XG | No|  HG0402XG V1.1 | 1M (Winbond 25Q) | |
+
+### Label specifications
+
+- **Name**: ZOERAX 2.5G 2SFP 4-Port Gigabit Switch
+- **Model**: HG0402XG-EU
+- **Ports**:  
+  - 4 × RJ45: 10/100/1000/2500 Mbps  
+  - 2 × SFP+: 1000 / 2500 / 10000 Mbps  
+<img src="photos/HG0402XG_V1_1/HG0402XG_V1_1_bottom.jpg" width="300" />
+
+## PCB
+
+<img src="photos/HG0402XG_V1_1/HG0402XG_V1_1_top.jpg" width="300" />
+<img src="photos/HG0402XG_V1_1/HG0402XG_V1_1_bottom.jpg" width="300" />
+
+Be aware that the UART header is metric, the pitch is 2mm. The JST PH2.0mm header shown was addeded after purchase
+
+### Installation
+
+Using SPI clamp on-board is the only method for initial installation.
+
+### What works
+
+- All four 2.5GBASE-T RJ45 ports at 10/100/1000/2500 Mbps
+- SFP ports with various 1G/10G Fiber and Ethernet modules 
+- LEDs

machine/ZOERAX_HG0402XG_V1_1.c

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+#include "machine_defs.h"
+__code const struct machine machine = {
+	.machine_name = "ZoeRax HG0402XG V1.1",
+	.isRTL8373 = 0,
+	.min_port = 3,
+	.max_port = 8,
+	.n_sfp = 2,
+	.log_to_phys_port = {0, 0, 0, 5, 1, 2, 3, 4, 6},
+	.phys_to_log_port = {4, 5, 6, 7, 3, 8, 0, 0, 0},
+	.is_sfp = {0, 0, 0, 1, 0, 0, 0, 0, 2},
+	// Left SFP port (5)
+	.sfp_port[0].pin_detect = GPIO30_ACL_BIT3_EN,
+	.sfp_port[0].pin_los = GPIO_NA,
+	.sfp_port[0].pin_tx_disable = GPIO_NA,
+	.sfp_port[0].sds = 1,
+	.sfp_port[0].i2c = I2CBUS( GPIO39_I2C_SDA4, GPIO40_I2C_SCL3_MDC1 ),
+	// Right SFP port (6)
+	.sfp_port[1].pin_detect = GPIO50_I2C_SCL2_UART1_TX,
+	.sfp_port[1].pin_los = GPIO_NA,
+	.sfp_port[1].pin_tx_disable = GPIO_NA,
+	.sfp_port[1].sds = 0,
+	.sfp_port[1].i2c = I2CBUS( GPIO41_I2C_SDA3_MDIO1, GPIO40_I2C_SCL3_MDC1 ),
+	.reset_pin = GPIO_NA,
+	.high_leds = { .mux = LED_27 | LED_29, .enable = LED_28_SYS | LED_29 },
+	.port_led_set = { 0, 0, 0, 1, 0, 0, 0, 0, 1},
+	/* On Ethernet: Left led is orange, right green
+	 * 100M and 1G give right led green with activity
+	 * 2.5GBit adds solid left orange LED
+	 * LEDs for the SFP-ports are the same as for the Ethernet ports
+	*/
+	.led_sets = { { LEDS_2G5 | LEDS_LINK | LEDS_ACT,
+			0,
+			LEDS_1G | LEDS_100M | LEDS_10M | LEDS_LINK | LEDS_ACT,
+			LEDS_2G5 | LEDS_LINK | LEDS_ACT
+		      },
+		      { LEDS_2G5 | LEDS_TWO_PAIR_1G | LEDS_1G | LEDS_500M | LEDS_100M | LEDS_10M |
+			LEDS_LINK | LEDS_ACT | LEDS_10G | LEDS_TWO_PAIR_5G | LEDS_5G | LEDS_TWO_PAIR_2G5,
+			LEDS_1G | LEDS_LINK,
+			LEDS_LINK,
+			LEDS_COL | LEDS_DUPLEX
+		      }
+		    }
+};
+

machine/ZOERAX_HG0402XG_V1_1.h

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+#ifndef _MACHINE_ZOERAX_HG0402XG_V1_1_H_
+#define _MACHINE_ZOERAX_HG0402XG_V1_1_H_
+
+#define MACHINE_MODEL "ZoeRax HG0402XG V1.1"
+
+#endif