AP_Bootloader: added STM32H7xx chip revisions

Tools/AP_Bootloader/mcu_h7.h

@@ -4,14 +4,19 @@
 
 #if defined(STM32H7)
 
-#define STM32_UNKNOWN	0
+#define STM32_UNKNOWN 0
+#define STM32_H743    0x450
 
 mcu_des_t mcu_descriptions[] = {
-    { STM32_UNKNOWN,	"STM32H7?????",		'?'},
+    { STM32_UNKNOWN,     "STM32H7???",    '?'},
+    { STM32_H743,        "STM32H743/753", '?'},
 };
 
 const mcu_rev_t silicon_revs[] = {
+    {0x1001, 'Z', false},
+    {0x1003, 'Y', false},
+    {0x2001, 'X', false},
+    {0x2003, 'V', false},
 };
 
 #endif // STM32H7
-