soc/amd/picasso/Kconfig: update VGA_BIOS_ID's help text

map_oprom_vendev_rev is implemented in graphics.c in the SoC directory.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I0123cb8ff662445fd0a613711d9e1981272b1235
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73052
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>
diff --git a/src/soc/amd/picasso/Kconfig b/src/soc/amd/picasso/Kconfig
index d34b2ab..8d5bfa7 100644
--- a/src/soc/amd/picasso/Kconfig
+++ b/src/soc/amd/picasso/Kconfig
@@ -227,7 +227,7 @@
 	default "1002,15d8,c1"
 	help
 	  The default VGA BIOS PCI vendor/device ID should be set to the
-	  result of the map_oprom_vendev_rev() function in northbridge.c.
+	  result of the map_oprom_vendev_rev() function in graphics.c.
 
 config VGA_BIOS_FILE
 	string