tint: Fix tint and add Kconfig option

Fix the compiler errors with tint, improves the Makefile,
adds Kconfig integration and secondary payload option.

Change-Id: Ia99e30f566d5ccf0d083e52bf174970535daefc5
Signed-off-by: Antonello Dettori <dettori.an@gmail.com>
Reviewed-on: https://review.coreboot.org/14989
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/payloads/external/Makefile.inc b/payloads/external/Makefile.inc
index d61fed6..02cb51d 100644
--- a/payloads/external/Makefile.inc
+++ b/payloads/external/Makefile.inc
@@ -124,6 +124,9 @@
 			CONFIG_UBOOT_MASTER=$(CONFIG_UBOOT_MASTER) \
 			CONFIG_UBOOT_STABLE=$(CONFIG_UBOOT_STABLE)
 
+payloads/external/tint/tint/tint.elf tint:
+	$(MAKE) -C payloads/external/tint
+
 cbfs-files-$(CONFIG_MEMTEST_SECONDARY_PAYLOAD) += img/memtest
 img/memtest-file := payloads/external/Memtest86Plus/memtest86plus/memtest
 img/memtest-type := payload
@@ -134,6 +137,10 @@
 		SERIAL_BAUD_RATE=$(CONFIG_TTYS0_BAUD)
 endif
 
+cbfs-files-$(CONFIG_TINT_SECONDARY_PAYLOAD) += img/tint
+img/tint-file := payloads/external/tint/tint/tint.elf
+img/tint-type := payload
+
 payloads/external/Memtest86Plus/memtest86plus/memtest: $(top)/$(DOTCONFIG)
 	$(MAKE) -C payloads/external/Memtest86Plus all \
 		CC="$(CC_x86_32)" \