image: Drop IMAGE_ENABLE_FIT

Make use of the host Kconfig for FIT. With this we can use
CONFIG_IS_ENABLED(FIT) directly in the host build, so drop the unnecessary
indirection.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
diff --git a/common/bootm.c b/common/bootm.c
index fe17d1d..8d614fe 100644
--- a/common/bootm.c
+++ b/common/bootm.c
@@ -115,7 +115,7 @@
 		images.os.arch = image_get_arch(os_hdr);
 		break;
 #endif
-#if IMAGE_ENABLE_FIT
+#if CONFIG_IS_ENABLED(FIT)
 	case IMAGE_FORMAT_FIT:
 		if (fit_image_get_type(images.fit_hdr_os,
 				       images.fit_noffset_os,
@@ -187,7 +187,7 @@
 		/* Kernel entry point is the setup.bin */
 	} else if (images.legacy_hdr_valid) {
 		images.ep = image_get_ep(&images.legacy_hdr_os_copy);
-#if IMAGE_ENABLE_FIT
+#if CONFIG_IS_ENABLED(FIT)
 	} else if (images.fit_uname_os) {
 		int ret;
 
@@ -295,7 +295,7 @@
 		set_working_fdt_addr(map_to_sysmem(images.ft_addr));
 #endif
 
-#if IMAGE_ENABLE_FIT
+#if CONFIG_IS_ENABLED(FIT)
 	if (IS_ENABLED(CONFIG_FPGA)) {
 		/* find bitstreams */
 		ret = boot_get_fpga(argc, argv, &images, IH_ARCH_DEFAULT,
@@ -858,7 +858,7 @@
 	const void *buf;
 	const char	*fit_uname_config = NULL;
 	const char	*fit_uname_kernel = NULL;
-#if IMAGE_ENABLE_FIT
+#if CONFIG_IS_ENABLED(FIT)
 	int		os_noffset;
 #endif
 
@@ -916,7 +916,7 @@
 		bootstage_mark(BOOTSTAGE_ID_DECOMP_IMAGE);
 		break;
 #endif
-#if IMAGE_ENABLE_FIT
+#if CONFIG_IS_ENABLED(FIT)
 	case IMAGE_FORMAT_FIT:
 		os_noffset = fit_image_load(images, img_addr,
 				&fit_uname_kernel, &fit_uname_config,