SecurityPkg/Tpm12CommandLib: Always check response returnCode

SecurityPkg/Tpm12CommandLib: Always check response returnCode

https://bugzilla.tianocore.org/show_bug.cgi?id=338

Update the Tpm12CommandLib to consistently check the returnCode
field of a response packet.  These checks are missing from the
GetCapability and SelfTest commands.  The functions
Tpm12ContinueSelfTest(), Tpm12GetCapabilityFlagPermanent(), and
Tpm12GetCapabilityFlagVolatile() are updated to verify that the
response returnCode is not an error.

Cc: Chao Zhang <chao.b.zhang@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Chao Zhang <chao.b.zhang@intel.com>