ANDROID: misc: pkvm_smc: Add pKVM SMC filter driver

Add a driver that filters SMCs during running KVM in protected mode.

This patch has the skeleton for the driver and its config, and the
logic is added in next patches.

Bug: 278009271
Bug: 278749606

Change-Id: I76b7f0c1fab49f38700d22a161c7cc92730f81a1
Signed-off-by: Mostafa Saleh <smostafa@google.com>