device/Kconfig: Clarify ON_DEVICE_ROM_LOAD

It's only used for VGA ROMs.

Change-Id: I898765f79cbf5ccce871a3598b56eda83e5efaca
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/19805
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>
diff --git a/src/device/Kconfig b/src/device/Kconfig
index cf70a980..04d8d81 100644
--- a/src/device/Kconfig
+++ b/src/device/Kconfig
@@ -117,9 +117,9 @@
 	bool "Load Option ROMs on PCI devices"
 	default n if PAYLOAD_SEABIOS
 	default y if !PAYLOAD_SEABIOS
-	depends on PCI
+	depends on VGA_ROM_RUN
 	help
-	  Load Option ROMs stored on PCI/PCIe/AGP devices in coreboot.
+	  Load Option ROMs stored on PCI/PCIe/AGP VGA devices in coreboot.
 
 	  If disabled, only Option ROMs stored in CBFS will be executed by
 	  coreboot. If you are concerned about security, you might want to