ideapad-laptop: Fix Makefile

The makefile didn't get updated when the driver changed name, which broke
the build.
Signed-off-by: Matthew Garrett <mjg@redhat.com>

drivers/platform/x86/Makefile

@@ -15,7 +15,7 @@ obj-$(CONFIG_ACERHDF)		+= acerhdf.o
 obj-$(CONFIG_HP_WMI)		+= hp-wmi.o
 obj-$(CONFIG_TC1100_WMI)	+= tc1100-wmi.o
 obj-$(CONFIG_SONY_LAPTOP)	+= sony-laptop.o
-obj-$(CONFIG_IDEAPAD_LAPTOP)	+= ideapad_laptop.o
+obj-$(CONFIG_IDEAPAD_LAPTOP)	+= ideapad-laptop.o
 obj-$(CONFIG_THINKPAD_ACPI)	+= thinkpad_acpi.o
 obj-$(CONFIG_FUJITSU_LAPTOP)	+= fujitsu-laptop.o
 obj-$(CONFIG_PANASONIC_LAPTOP)	+= panasonic-laptop.o