devices: Add tpm device

This device emulates a tpm device in cloud-hypervisor. Read and write support
to miminal set of control registers is supported.

Non-control commands will be processed as reads and write to
CRB_DATA_BUFFER. Reads and Writes to this data buffer are forwarded to
swtpm via the configured data_fd.

Signed-off-by: Praveen K Paladugu <prapal@linux.microsoft.com>
Co-authored-by: Sean Yoo <t-seanyoo@microsoft.com>

devices/src/lib.rs

@@ -19,6 +19,7 @@ pub mod interrupt_controller;
 #[cfg(target_arch = "x86_64")]
 pub mod ioapic;
 pub mod legacy;
+pub mod tpm;
 
 pub use self::acpi::{AcpiGedDevice, AcpiPmTimerDevice, AcpiShutdownDevice};