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 <[email protected]>

package/boot/tfa-layerscape/Makefile

@@ -25,7 +25,7 @@ HOST_CFLAGS += -Wall -Werror -pedantic -std=c99
 define Host/Compile
 	$(MAKE) -C \
 		$(HOST_BUILD_DIR)/tools/fiptool \
-		PLAT_FIPTOOL_HELPER_MK="$(HOST_BUILD_DIR)/tools/nxp/plat_fiptool/plat_fiptool.mk"
+		PLAT_FIPTOOL_HELPER_MK="$(HOST_BUILD_DIR)/tools/nxp/plat_fiptool/plat_fiptool.mk" \
 		CFLAGS="$(HOST_CFLAGS)" \
 		LDFLAGS="$(HOST_LDFLAGS)" \
 		HOSTCCFLAGS="$(HOST_CFLAGS)"

package/boot/tfa-layerscape/patches/001-fiptool-hostbuild-fixes.patch

@@ -88,3 +88,19 @@
  	@${ECHO_BLANK_LINE}
  	@echo "Built $@ successfully"
  	@${ECHO_BLANK_LINE}
+--- a/tools/nxp/plat_fiptool/plat_fiptool.mk	2023-05-20 22:28:28.079945619 +0200
++++ b/tools/nxp/plat_fiptool/plat_fiptool.mk	2023-05-20 22:26:59.443307771 +0200
+@@ -22,11 +22,11 @@ INCLUDE_PATHS += -I${PLAT_DEF_UUID_OID_C
+ $(shell rm ${PLAT_DEF_UUID_CONFIG_FILE_PATH}/${PLAT_DEF_UUID_CONFIG_FILE_NAME}.o)
+ 
+ ifeq (${PLAT_DEF_OID},yes)
+-HOSTCCFLAGS += -DPLAT_DEF_OID
++override HOSTCCFLAGS += -DPLAT_DEF_OID
+ endif
+ 
+ ifeq (${PLAT_DEF_UUID},yes)
+-HOSTCCFLAGS += -DPLAT_DEF_FIP_UUID
++override HOSTCCFLAGS += -DPLAT_DEF_FIP_UUID
+ PLAT_OBJECTS += ${PLAT_DEF_UUID_CONFIG_FILE_PATH}/${PLAT_DEF_UUID_CONFIG_FILE_NAME}.o
+ endif
+