platform/x86/siemens: Kconfig: adjust help text

There was a copy and paste mistake where the module name was not
correct.

Fixes: 917f5434 ("platform/x86: simatic-ipc: add CMOS battery monitoring")
Signed-off-by: Henning Schild <henning.schild@siemens.com>
Link: https://lore.kernel.org/r/20230725093113.9739-3-henning.schild@siemens.comReviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/siemens/Kconfig

@@ -60,4 +60,4 @@ config SIEMENS_SIMATIC_IPC_BATT_F7188X
 	  from Siemens based on Nuvoton GPIO.
 
 	  To compile this driver as a module, choose M here: the module
-	  will be called simatic-ipc-batt-elkhartlake.
+	  will be called simatic-ipc-batt-f7188x.