smcf: Add module interface and high level functions

This patch adds the main module structure and functions.
It includes the module and element initialization and the
hardware configuration.
Also, add the API which contains two functions to interface
with other modules. The first function to start sampling and
the second to read the data.

Signed-off-by: Tarek El-Sherbiny <tarek.el-sherbiny@arm.com>
Co-authored-by: Abhishek Rawat <abhishek.rawat@arm.com>
Change-Id: I2dea10aab526b26180117a7b3ccc6c8c65c23c89