spl: fit: select SPL_HASH_SUPPORT for SPL_FIT_SIGNATURE

rsa-checsum needs support for hash functions or else will run into
compile errors like:
u-boot/lib/rsa/rsa-checksum.c:28: undefined reference to `hash_progressive_lookup_algo'

So similar to the main FIT_SIGNATURE entry selects HASH,
select SPL_HASH_SUPPORT for SPL_FIT_SIGNATURE.

Cc: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/Kconfig b/Kconfig
index 99bc5fa..8151be6 100644
--- a/Kconfig
+++ b/Kconfig
@@ -509,6 +509,7 @@
 	bool "Enable signature verification of FIT firmware within SPL"
 	depends on SPL_DM
 	select SPL_FIT
+	select SPL_HASH_SUPPORT
 	select SPL_RSA
 	select SPL_RSA_VERIFY
 	select SPL_IMAGE_SIGN_INFO