Kconfig: Move CONFIG_FIT and related options to Kconfig

There are already two FIT options in Kconfig but the CONFIG options are
still in the header files. We need to do a proper move to fix this.

Move these options to Kconfig and tidy up board configuration:

   CONFIG_FIT
   CONFIG_OF_BOARD_SETUP
   CONFIG_OF_SYSTEM_SETUP
   CONFIG_FIT_SIGNATURE
   CONFIG_FIT_BEST_MATCH
   CONFIG_FIT_VERBOSE
   CONFIG_OF_STDOUT_VIA_ALIAS
   CONFIG_RSA

Unfortunately the first one is a little complicated. We need to make sure
this option is not enabled in SPL by this change. Also this option is
enabled automatically in the host builds by defining CONFIG_FIT in the
image.h file. To solve this, add a new IMAGE_USE_FIT #define which can
be used in files that are built on the host but must also build for U-Boot
and SPL.

Note: Masahiro's moveconfig.py script is amazing.

Signed-off-by: Simon Glass <sjg@chromium.org>
[trini: Add microblaze change, various configs/ re-applies]
Signed-off-by: Tom Rini <trini@konsulko.com>

cmd/disk.c

@@ -22,7 +22,7 @@ int common_diskboot(cmd_tbl_t *cmdtp, const char *intf, int argc,
 #endif
 	block_dev_desc_t *dev_desc;
 
-#if defined(CONFIG_FIT)
+#if CONFIG_IS_ENABLED(FIT)
 	const void *fit_hdr = NULL;
 #endif
 
@@ -82,7 +82,7 @@ int common_diskboot(cmd_tbl_t *cmdtp, const char *intf, int argc,
 		cnt = image_get_image_size(hdr);
 		break;
 #endif
-#if defined(CONFIG_FIT)
+#if CONFIG_IS_ENABLED(FIT)
 	case IMAGE_FORMAT_FIT:
 		fit_hdr = (const void *) addr;
 		puts("Fit image detected...\n");
@@ -108,7 +108,7 @@ int common_diskboot(cmd_tbl_t *cmdtp, const char *intf, int argc,
 	}
 	bootstage_mark(BOOTSTAGE_ID_IDE_READ);
 
-#if defined(CONFIG_FIT)
+#if CONFIG_IS_ENABLED(FIT)
 	/* This cannot be done earlier,
 	 * we need complete FIT image in RAM first */
 	if (genimg_get_format((void *) addr) == IMAGE_FORMAT_FIT) {