mb/system76/lemp9: drop FSP_M_XIP

Drop FSP_M_XIP since it's selected by the soc already.

Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Change-Id: I999d369be395de08d4ab7f115fedf4b7fa10eb34
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43635
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jeremy Soller <jeremy@system76.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by:  Felix Singer <felixsinger@posteo.net>

src/mainboard/system76/lemp9/Kconfig

@@ -77,10 +77,6 @@ config VGA_BIOS_ID
 	string
 	default "8086,9b41"
 
-config FSP_M_XIP
-	bool
-	default y
-
 config POST_DEVICE
 	bool
 	default n