Updated related to new optee linux driver implementation

Change-Id: Ic6a33daffd721e644dad5fa5c9b89327fa9e00c3
Signed-off-by: Cedric Chaumont <cedric.chaumont@st.com>

First pass for code review
Dependancy optee_linux_driver pr#7
New design based on platform device driver
Validated on stm h410
4 ST failing tests (w/o optee-os patches) 1005, 6010, 7505, 7633
Maybe time to introduce an environment variable instead of relative paths? Also when the driver finds its new home inside Linux kernel source you will get a warning (when building) about including source directly from kernel.