[nrf fromtree] zephyr: Fix ED25519 compilation with mbedTLS

ED25519 with mbedTLS has not been linking due to missing SHA512,
which is internally required by ED25519 implementation.

Signed-off-by: Dominik Ermel <[email protected]>
(cherry picked from commit f523c60)

Author: de-nordic

boot/zephyr/Kconfig

@@ -295,7 +295,9 @@ config BOOT_ED25519_TINYCRYPT
 config BOOT_ED25519_MBEDTLS
 	bool "Use mbedTLS"
 	select BOOT_USE_MBEDTLS
+	select BOOT_IMG_HASH_ALG_SHA512_ALLOW
 	select MBEDTLS
+	select MBEDTLS_SHA512
 	select MBEDTLS_ASN1_PARSE_C if MBEDTLS_BUILTIN && !BOOT_KEY_IMPORT_BYPASS_ASN
 	select BOOT_AES_MBEDTLS_DEPENDENCIES if MBEDTLS_BUILTIN && BOOT_ENCRYPT_IMAGE