board/librem_{mini,v2,14}: Disable iGPU passthru for consistency

We use 'iommu=igfx_off' for booting the Heads kernel, so use the same for
booting the OS to ensure consistency when kexecing
Signed-off-by: Matt DeVillier <matt.devillier@puri.sm>

boards/librem_14/librem_14.config

@@ -32,8 +32,8 @@ export CONFIG_TPM_NO_LUKS_DISK_UNLOCK=y
 export CONFIG_BOOTSCRIPT=/bin/gui-init
 export CONFIG_BOOT_REQ_HASH=n
 export CONFIG_BOOT_REQ_ROLLBACK=n
-export CONFIG_BOOT_KERNEL_ADD="intel_iommu=on"
-export CONFIG_BOOT_KERNEL_REMOVE=""
+export CONFIG_BOOT_KERNEL_ADD="intel_iommu=igfx_off"
+export CONFIG_BOOT_KERNEL_REMOVE="intel_iommu=on"
 export CONFIG_BOOT_DEV="/dev/nvme0n1p1"
 export CONFIG_BOARD_NAME="Librem 14"
 export CONFIG_FLASHROM_OPTIONS="-p internal"

boards/librem_mini/librem_mini.config

@@ -32,8 +32,8 @@ export CONFIG_TPM_NO_LUKS_DISK_UNLOCK=y
 export CONFIG_BOOTSCRIPT=/bin/gui-init
 export CONFIG_BOOT_REQ_HASH=n
 export CONFIG_BOOT_REQ_ROLLBACK=n
-export CONFIG_BOOT_KERNEL_ADD="intel_iommu=on"
-export CONFIG_BOOT_KERNEL_REMOVE=""
+export CONFIG_BOOT_KERNEL_ADD="intel_iommu=igfx_off"
+export CONFIG_BOOT_KERNEL_REMOVE="intel_iommu=on"
 export CONFIG_BOOT_DEV="/dev/nvme0n1p1"
 export CONFIG_BOARD_NAME="Librem Mini"
 export CONFIG_FLASHROM_OPTIONS="-p internal"

boards/librem_mini_v2/librem_mini_v2.config

@@ -32,8 +32,8 @@ export CONFIG_TPM_NO_LUKS_DISK_UNLOCK=y
 export CONFIG_BOOTSCRIPT=/bin/gui-init
 export CONFIG_BOOT_REQ_HASH=n
 export CONFIG_BOOT_REQ_ROLLBACK=n
-export CONFIG_BOOT_KERNEL_ADD="intel_iommu=on"
-export CONFIG_BOOT_KERNEL_REMOVE=""
+export CONFIG_BOOT_KERNEL_ADD="intel_iommu=igfx_off"
+export CONFIG_BOOT_KERNEL_REMOVE="intel_iommu=on"
 export CONFIG_BOOT_DEV="/dev/nvme0n1p1"
 export CONFIG_BOARD_NAME="Librem Mini v2"
 export CONFIG_FLASHROM_OPTIONS="-p internal"