mb/lenovo/haswell: Make INT15 support T440p specific

In preparation to CB:63514, make the INT15 support specific for the
T440p variant since the W541 doesn't support it currently.

Change-Id: I8dfcc061e1b8a831f75bf9a8035770cb678a85d4
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66106
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/lenovo/haswell/Kconfig

@@ -10,7 +10,6 @@ config BOARD_LENOVO_HASWELL_COMMON
 	select HAVE_CMOS_DEFAULT
 	select HAVE_OPTION_TABLE
 	select INTEL_GMA_HAVE_VBT
-	select INTEL_INT15
 	select MAINBOARD_HAS_LIBGFXINIT
 	select MAINBOARD_HAS_TPM1
 	select MAINBOARD_USES_IFD_GBE_REGION
@@ -23,6 +22,7 @@ config BOARD_LENOVO_HASWELL_COMMON
 
 config BOARD_LENOVO_THINKPAD_T440P
 	select BOARD_LENOVO_HASWELL_COMMON
+	select INTEL_INT15
 
 if BOARD_LENOVO_HASWELL_COMMON
 

src/mainboard/lenovo/haswell/Makefile.inc

@@ -1,7 +1,6 @@
 romstage-y += variants/$(VARIANT_DIR)/gpio.c
 romstage-y += variants/$(VARIANT_DIR)/romstage.c
 
-ramstage-y += mainboard.c
 ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += variants/$(VARIANT_DIR)/gma-mainboard.ads
 
 subdirs-y += variants/$(VARIANT_DIR)

src/mainboard/lenovo/haswell/variants/t440p/Makefile.inc

@@ -0,0 +1 @@
+ramstage-y += mainboard.c