MAX7456: Adjustable screen area position offsets

There are displays and goggles with slightly different timing
characteristics compared the standard ones. With such devices, screen
area may be too high or too low that top or bottom most characters may
be truncated.

This PR provides a way to adjust the screen area position so that
entire screen area can be shifted up or down, or left or right.

A new vcdProfile_t (VCD = Video Character Device) is defined and
video_system was moved from osdProfile also.

src/main/fc/config.c

@@ -42,6 +42,7 @@
 #include "drivers/rx_spi.h"
 #include "drivers/serial.h"
 #include "drivers/pwm_output.h"
+#include "drivers/vcd.h"
 #include "drivers/max7456.h"
 #include "drivers/sound_beeper.h"
 #include "drivers/light_ws2811strip.h"
@@ -483,6 +484,15 @@ void resetServoMixerConfig(servoMixerConfig_t *servoMixerConfig)
 }
 #endif
 
+#ifdef USE_MAX7456
+void resetMax7456Config(vcdProfile_t *pVcdProfile)
+{
+    pVcdProfile->video_system = 0; // AUTO see drivers/max7456.h
+    pVcdProfile->h_offset = 0;
+    pVcdProfile->v_offset = 0;
+}
+#endif
+
 uint8_t getCurrentProfile(void)
 {
     return masterConfig.current_profile_index;