Revert "firmware_class: Add an additional path to fw_path list"

This reverts commit 2f524065 ("firmware_class: Add an additional
path to fw_path list").Selinux Violation observed,while enabling this
patch,because diag process  tries to access firmware in /firmware/images in
fw_path but don't have appropriate permisson to access this node.

CRs-Fixed: 987208
Change-Id: I9ee0001b5b1155936cd2dfa2ce3cd9d82de3b941
Signed-off-by: Gaurav Kohli <gkohli@codeaurora.org>