lv_misc: Add new font FONT_SYMBOL_60 of size 60px

New font added with similar symbol to that of symbol_30 but of double
height.

Signed-off-by: Ajay Bhargav <contact@rickeyworld.info>

lv_misc/font.h

@@ -49,6 +49,9 @@ typedef enum
 #endif
 #if USE_FONT_SYMBOL_30 != 0
     FONT_SYMBOL_30,
+#endif
+#if USE_FONT_SYMBOL_60 != 0
+    FONT_SYMBOL_60,
 #endif
     FONT_TYPE_NUM,
 }font_types_t;