Enabling PKVM for Total Compute

Linux configuration update to enable `CONFIG_ARM_SMMU_V3_PKVM`
in `files/kernel/tc2/pkvm.cfg`. This change relies on updated
Linux kernel that provisions GPU and DPU to be used with Arm
SMMU-700. Note that this will also require an updated FVP to
be used.

Signed-off-by: Kshitij Sisodia <kshitij.sisodia@arm.com>