hwcaps: add fe_offset_max for spark

include/hardware_caps.h

@@ -35,6 +35,7 @@ typedef struct hw_caps
 	int display_yres;
 #ifdef MARTII
 	int fe_offset;
+	int fe_offset_max;
 #endif
 	char boxvendor[64];
 	char boxname[64];

libspark/hardware_caps.c

@@ -70,6 +70,7 @@ hw_caps_t *get_hwcaps(void)
 					caps.has_SCART = 1;
 #ifdef MARTII
 					caps.fe_offset = 1; // first sat tuner
+					caps.fe_offset_max = 2; // last tuner
 #endif
 					break;
 				default: