vfb: Document option to enable the driver

From: Mike Frysinger <[email protected]>

the Kconfig help text doesnt mention that in order to load the vfb module, you have to pass in the parameter vfb_enable=1

Document required module options in Kconfig for loading the vfb module.

---

 drivers/video/Kconfig |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

index 29aea96..4dc10b7 100644
@@ -1617,7 +1617,8 @@ config FB_VIRTUAL
 	  kernel option `video=vfb:'.
 
 	  To compile this driver as a module, choose M here: the
-	  module will be called vfb.
+	  module will be called vfb. In order to load it, you must use
+	  the vfb_enable=1 option.
 
 	  If unsure, say N.
 if VT

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