fbcon: Revise primary device selection

Use set_con2fb_map() to select the primary display driver instead of using unbind_con_driver() and bind_con_driver(). Using the former is much simpler and safer than the current one.

---
I was forced to use unbind_con_driver/bind_con_driver initially because set_con2fb_map() is broken. Now that it is fixed, I can move primary device selection to set_con2fb_map. There is lesser complexity and lesser code, and it does not depend on the VT layer.

Tony

 drivers/video/console/Kconfig |    6 +----
 drivers/video/console/fbcon.c |   51 +++++++++++------------------------------
 2 files changed, 15 insertions(+), 42 deletions(-)

index 1e11d30..449f92c 100644
@@ -120,7 +120,7 @@ config FRAMEBUFFER_CONSOLE
 
 config FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
        bool "Map the console to the primary display device"
-       depends on FRAMEBUFFER_CONSOLE && VT_HW_CONSOLE_BINDING
+       depends on FRAMEBUFFER_CONSOLE
        default n
        ---help---
          If this option is selected, the framebuffer console will

@@ -132,10 +132,6 @@ config FRAMEBUFFER_CONSOLE_DETECT_PRIMAR
 	 You can always override the automatic selection of the primary device
 	 by using the fbcon=map: boot option.
 
-	 To select this feature, "Support for binding and unbinding console
-         drivers", under "Device Drivers"->"Character Devices" must be set to
-	 y.
-
 	 If unsure, select n.
 
 config FRAMEBUFFER_CONSOLE_ROTATION

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