platform/x86: dell-wmi: Rename dell-wmi.c to dell-wmi-base.c

Rename dell-wmi.c to dell-wmi-base.c, so that we can have other
dell-wmi-foo.c files which can be added to dell-wmi.ko as "plugins"
controlled by separate boolean Kconfig options.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

MAINTAINERS

@@ -5170,7 +5170,7 @@ DELL WMI NOTIFICATIONS DRIVER
 M:	Matthew Garrett <mjg59@srcf.ucam.org>
 M:	Pali Rohár <pali@kernel.org>
 S:	Maintained
-F:	drivers/platform/x86/dell/dell-wmi.c
+F:	drivers/platform/x86/dell/dell-wmi-base.c
 
 DELTA ST MEDIA DRIVER
 M:	Hugues Fruchet <hugues.fruchet@foss.st.com>

drivers/platform/x86/dell/Makefile

@@ -15,6 +15,7 @@ dell-smbios-$(CONFIG_DELL_SMBIOS_WMI)	+= dell-smbios-wmi.o
 dell-smbios-$(CONFIG_DELL_SMBIOS_SMM)	+= dell-smbios-smm.o
 obj-$(CONFIG_DELL_SMO8800)		+= dell-smo8800.o
 obj-$(CONFIG_DELL_WMI)			+= dell-wmi.o
+dell-wmi-objs				:= dell-wmi-base.o
 obj-$(CONFIG_DELL_WMI_AIO)		+= dell-wmi-aio.o
 obj-$(CONFIG_DELL_WMI_DESCRIPTOR)	+= dell-wmi-descriptor.o
 obj-$(CONFIG_DELL_WMI_LED)		+= dell-wmi-led.o