Cleanup Libtomcrypt

- Do not compile libtomcrypt tests anymore
- Define LTC_NO_FILE to remove all file operations in libtomcrypt
- Minor fix in argument description of malloc

Signed-off-by: Pascal Brand <pascal.brand@st.com>
Fix compilation issue when there is no traces
subdir.mk supports absolute path

Signed-off-by: Pascal Brand <pascal.brand@st.com>