ECC macros used in the following files:
library/pk.c
library/pk_wrap.c
library/pkparse.c
library/pkwrite.c
library/ssl_misc.h
library/ssl_tls12_client.c
FFDH macro use only in library/ssl_misc.h so could possibly be moved
there, but it seems cleaner to keep it close to the ECC macros are they
are very similar in nature.
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>