arm:at91: enable ROM loadable atmel image

For sama5d3xek we need to modify the SPL image for correct detection by ROM
code.

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
Tested-by: Bo Shen <voice.shen@atmel.com>
diff --git a/tools/Makefile b/tools/Makefile
index e6d8045..7610557 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -38,6 +38,8 @@
 ENVCRC-$(CONFIG_ENV_IS_IN_SPI_FLASH) = y
 CONFIG_BUILD_ENVCRC ?= $(ENVCRC-y)
 
+hostprogs-$(CONFIG_SPL_GENERATE_ATMEL_PMECC_HEADER) += atmel_pmecc_params$(SFX)
+
 # TODO: CONFIG_CMD_LICENSE does not work
 hostprogs-$(CONFIG_CMD_LICENSE) += bin2header$(SFX)
 hostprogs-$(CONFIG_LCD_LOGO) += bmp_logo$(SFX)