[qca-nss-ecm] change front end name to sfe in all files of sfe front end

This commit aim to create sfe front end base on nss front end.
It has no functionality change. It includes following changes:
1, change makefile to compile sfe front end
2, change init function to select nss or sfe front end according
   to platform
3, change all function name and variable name to sfe to make
   an independent front end
4, Use APIs of sfe simulated driver to talk with sfe acceleration engine

Change-Id: I528e4cfdd31dd986274c467869b731aa4a902f92
Signed-off-by: Xiaoping Fan <xfan@codeaurora.org>
25 files changed