tfa-layerscape: fix fiptool's build
A missing '\' caused the remaining parameters not to be passed to make.
This fixes the following error:
| gcc -c [...] fiptool.c -o fiptool.o
| In file included from fiptool.h:16,
| from fiptool.c:19:
|fiptool_platform.h:19:11: fatal error: openssl/sha.h: No such file or directory
| 19 | # include <openssl/sha.h>
| | ^~~~~~~~~~~~~~~
|compilation terminated.
|make[3]: *** [Makefile:58: fiptool.o] Error 1
as the HOST_CFLAGS are no longer passed.
then, HOST_CFLAGS is specified as a command argument, this
is a specific problem of our built since appending these
needs the override directive.
Fixes: df28bfe03247 ("tfa-layerscape: Change to github and use the latest tag")
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>