Disable CFI for vendor variants of all components

The current VNDK ABI snapshot expects that CFI is disabled for
components that either in the include paths (from cfi-common.mk) OR
enabled directly in the makefile/blueprint. However, on non-arm64
architectures, the build system was only disabling CFI for vendor
components in the include paths.

This topic corrects it by (a) removing the include paths check to
disable CFI for vendor variants (this CL), and (b) inheriting the CFI
include paths in all product configs to ensure that when we update the
ABI we're able to move to relying exclusively
on (PRODUCT_)CFI_INCLUDE_PATHS.

Bug: 66301104
Test: ABI matches for all architectures.
Change-Id: I648edf13346b18fd88b623682e8590ed44709e0d