image: Rename CONFIG_FIT_ENABLE_RSASSA_PSS_SUPPORT

Drop the ENABLE and SUPPORT parts of this, which are redundant.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
diff --git a/common/Kconfig.boot b/common/Kconfig.boot
index d28ce96..ae3f2b6 100644
--- a/common/Kconfig.boot
+++ b/common/Kconfig.boot
@@ -103,7 +103,7 @@
 	  device memory. Assure this size does not extend past expected storage
 	  space.
 
-config FIT_ENABLE_RSASSA_PSS_SUPPORT
+config FIT_RSASSA_PSS
 	bool "Support rsassa-pss signature scheme of FIT image contents"
 	depends on FIT_SIGNATURE
 	default n