MAINTAINERS: assign include/tpm*, cmd/tpm*

The files include/tpm* are an integral part of the TPM drivers.
The tpm* commands are used to access TPM devices.

Both should be managed by the TPM DRIVERS maintainer.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>