amx3-cm3: Fix building with poky-lsb
amx3-cm3: Fix building with poky-lsb

One of the features of poky-lsb is that it brings in the
security_flags.inc file that sets a number of security-related compile
time flags.  This includes changing some of the default GCC build
options.  However, for building the amx3-cm3 firmware we want to ensure
that none of this enabled as it's not useful in this particular
environment.  We must pass in ${SECURITY_NOPIE_CFLAGS} to disable PIE.
When security_flags.inc is not present this is an empty string so is
safe to do at all times.

Signed-off-by: Tom Rini <47764aff062bf9ebe98a2274b29052b74a9567e2@konsulko.com>
Signed-off-by: Denys Dmytriyenko <d29de71aea38aad3a87d486929cb0aad173ae612@ti.com>

rcn-ee/meta-ti,rcn-ee/meta-ti,rcn-ee/meta-ti,rcn-ee/meta-ti