libstb/tpm_chip.h: declare the TpmTarget type for TSS
libstb/tpm_chip.h: declare the TpmTarget type for TSS

This declares the TpmTarget for TSS. This could be done in
'libstb/tss/trustedboot.H', but it causes a dependency cycle among
trustedboot.H, trustedTypes.H and tpm_chip.h.

Signed-off-by: Claudio Carvalho <e431f4b4a17082357e3d270b337bd485cc81832b@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

legoater/skiboot,open-power/skiboot,shenki/skiboot,stewart-ibm/skiboot,mikey/skiboot,legoater/skiboot,stewart-ibm/skiboot,open-power/skiboot,open-power/skiboot,shenki/skiboot,qemu/skiboot,shenki/skiboot,mikey/skiboot,legoater/skiboot,qemu/skiboot,qemu/skiboot,open-power/skiboot,mikey/skiboot,open-power/skiboot,shenki/skiboot,qemu/skiboot,shenki/skiboot,legoater/skiboot,legoater/skiboot,qemu/skiboot,stewart-ibm/skiboot