PM / VT: Cleanup #if defined uglyness and fix compile error

Introduce the config option CONFIG_VT_CONSOLE_SLEEP in order to cleanup
the #if defined ugliness for the vt suspend support functions. Note that
CONFIG_VT_CONSOLE is already dependant on CONFIG_VT.

The function pm_set_vt_switch is actually dependant on CONFIG_VT and not
CONFIG_PM_SLEEP. This fixes a compile error when CONFIG_PM_SLEEP is
not set:

drivers/tty/vt/vt_ioctl.c:1794: error: redefinition of 'pm_set_vt_switch'
include/linux/suspend.h:17: error: previous definition of 'pm_set_vt_switch' was here

Also, remove the incorrect path from the comment in console.c.

[rjw: Replaced #if defined() with #ifdef in suspend.h.]

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
diff --git a/drivers/tty/Kconfig b/drivers/tty/Kconfig
index bd7cc05..a7188a0 100644
--- a/drivers/tty/Kconfig
+++ b/drivers/tty/Kconfig
@@ -60,6 +60,10 @@
 
 	  If unsure, say Y.
 
+config VT_CONSOLE_SLEEP
+	def_bool y
+	depends on VT_CONSOLE && PM_SLEEP
+
 config HW_CONSOLE
 	bool
 	depends on VT && !S390 && !UML