DM: crypto/fsl - Add Freescale rsa DM driver

Driver added for RSA Modular Exponentiation using Freescale Hardware
Accelerator CAAM. The driver uses UCLASS_MOD_EXP

Signed-off-by: Ruchika Gupta <ruchika.gupta@freescale.com>
CC: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/crypto/fsl/Kconfig b/drivers/crypto/fsl/Kconfig
new file mode 100644
index 0000000..86b2f2f
--- /dev/null
+++ b/drivers/crypto/fsl/Kconfig
@@ -0,0 +1,6 @@
+config FSL_CAAM
+	bool "Freescale Crypto Driver Support"
+	help
+	  Enables the Freescale's Cryptographic Accelerator and Assurance
+	  Module (CAAM), also known as the SEC version 4 (SEC4). The driver uses
+	  Job Ring as interface to communicate with CAAM.