Convert CONFIG_CMD_HASH to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_HASH

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
[trini: Rework slightly, enable on some boards again]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/crypto/fsl/Kconfig b/drivers/crypto/fsl/Kconfig
index 3ccd196..181a1e5 100644
--- a/drivers/crypto/fsl/Kconfig
+++ b/drivers/crypto/fsl/Kconfig
@@ -1,6 +1,7 @@
 config FSL_CAAM
 	bool "Freescale Crypto Driver Support"
 	select SHA_HW_ACCEL
+	imply CMD_HASH
 	help
 	  Enables the Freescale's Cryptographic Accelerator and Assurance
 	  Module (CAAM), also known as the SEC version 4 (SEC4). The driver uses