device: Rephrase bus master Kconfig option

Change-Id: I902915133035fb2adff7edd9c931d4b1d3e7dc40
Signed-off-by: Felix Singer <felix.singer@secunet.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46341
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/src/device/Kconfig b/src/device/Kconfig
index b69a254..cbe970f 100644
--- a/src/device/Kconfig
+++ b/src/device/Kconfig
@@ -520,7 +520,7 @@
 	default y
 
 config PCI_ALLOW_BUS_MASTER
-	bool "Allow PCI bus master bit to be enabled by coreboot"
+	bool "Allow coreboot to set optional PCI bus master bits"
 	default y
 	help
 	  For security reasons, bus mastering should be enabled as late as