image: Drop IMAGE_ENABLE_SHA1

We already have a host Kconfig for SHA1. Use CONFIG_IS_ENABLED(SHA1)
directly in the code shared with the host build, so we can drop the
unnecessary indirection.

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/image-fit.c b/common/image-fit.c
index e9b455d..9a47d1b 100644
--- a/common/image-fit.c
+++ b/common/image-fit.c
@@ -1219,7 +1219,7 @@
 							CHUNKSZ_CRC32);
 		*((uint32_t *)value) = cpu_to_uimage(*((uint32_t *)value));
 		*value_len = 4;
-	} else if (IMAGE_ENABLE_SHA1 && strcmp(algo, "sha1") == 0) {
+	} else if (CONFIG_IS_ENABLED(SHA1) && strcmp(algo, "sha1") == 0) {
 		sha1_csum_wd((unsigned char *)data, data_len,
 			     (unsigned char *)value, CHUNKSZ_SHA1);
 		*value_len = 20;