t440p: Enable i915 kexec framebuffer fixes

Add CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM and related kernel parameters to
t440p.  This board is already on kernel 5.10 and uses i915 graphics.

Signed-off-by: Jonathon Hall <[email protected]>

Author: JonathonHall-Purism

config/coreboot-t440p.config

@@ -7,7 +7,7 @@ CONFIG_ME_BIN_PATH="@BLOB_DIR@/t440p/me.bin"
 CONFIG_GBE_BIN_PATH="@BLOB_DIR@/t440p/gbe.bin"
 CONFIG_HAVE_IFD_BIN=y
 CONFIG_BOARD_LENOVO_THINKPAD_T440P=y
-CONFIG_LINUX_COMMAND_LINE="intel_iommu=igfx_off"
+CONFIG_LINUX_COMMAND_LINE="intel_iommu=igfx_off drm_kms_helper.drm_leak_fbdev_smem=1 i915.enable_fbc=0"
 CONFIG_TPM_MEASURED_BOOT=y
 CONFIG_HAVE_MRC=y
 CONFIG_MRC_FILE="@BLOB_DIR@/haswell/mrc.bin"

config/linux-t440p.config

@@ -199,6 +199,7 @@ CONFIG_I2C_SLAVE=y
 # CONFIG_X86_PKG_TEMP_THERMAL is not set
 CONFIG_MFD_SYSCON=y
 CONFIG_DRM=y
+CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM=y
 CONFIG_DRM_I915=y
 CONFIG_DRM_AST=y
 CONFIG_FB_VESA=y