Disable SDSUPPORT by default

As noted in #133 you can’t disable `SDSUPPORT` with `MAKRPANEL`,
`PANEL_ONE`, `MINIPANEL`, or `ULTIPANEL`. This patch makes it possible
to disable `SDSUPPORT` on these controllers and then disables it by
default.

Users of these controllers will now need to enable `SDSUPPORT` in their
configurations as others currently do.

Marlin/Conditionals.h

@@ -16,7 +16,6 @@
 
   #if ENABLED(MAKRPANEL)
     #define DOGLCD
-    #define SDSUPPORT
     #define DEFAULT_LCD_CONTRAST 17
     #define ULTIPANEL
     #define NEWPANEL
@@ -48,7 +47,6 @@
 
 
   #if ENABLED(PANEL_ONE)
-    #define SDSUPPORT
     #define ULTIMAKERCONTROLLER
   #endif
 
@@ -77,7 +75,6 @@
 
   #if ENABLED(MINIPANEL)
    #define DOGLCD
-   #define SDSUPPORT
    #define ULTIPANEL
    #define NEWPANEL
    #define DEFAULT_LCD_CONTRAST 17
@@ -145,7 +142,6 @@
 
   #if ENABLED(ULTIPANEL)
     #define NEWPANEL  //enable this if you have a click-encoder panel
-    #define SDSUPPORT
     #define ULTRA_LCD
     #if ENABLED(DOGLCD) // Change number of lines to match the DOG graphic display
       #define LCD_WIDTH 22