Move up to mbed TLS 2.x

The mbed TLS library has introduced some changes in the API from
the 1.3.x to the 2.x releases. Using the 2.x releases requires
some changes to the crypto and transport modules.

This patch updates both modules to the mbed TLS 2.x API.

All references to the mbed TLS library in the code or documentation
have been updated to 'mbed TLS'. Old references to PolarSSL have
been updated to 'mbed TLS'.

User guide updated to use mbed TLS 2.2.0.

NOTE: moving up to mbed TLS 2.x from 1.3.x is not backward compatible.
Applying this patch will require an mbed TLS 2.x release to be used.
Also note that the mbed TLS license changed to Apache version 2.0.

Change-Id: Iba4584408653cf153091f2ca2ee23bc9add7fda4
diff --git a/drivers/auth/mbedtls/mbedtls_crypto.mk b/drivers/auth/mbedtls/mbedtls_crypto.mk
index 67d2eb4..275ed55 100644
--- a/drivers/auth/mbedtls/mbedtls_crypto.mk
+++ b/drivers/auth/mbedtls/mbedtls_crypto.mk
@@ -62,10 +62,10 @@
     					)
     MBEDTLS_KEY_ALG_ID		:=	MBEDTLS_RSA
 else
-    $(error "MBEDTLS_KEY_ALG=${MBEDTLS_KEY_ALG} not supported on mbedTLS")
+    $(error "MBEDTLS_KEY_ALG=${MBEDTLS_KEY_ALG} not supported on mbed TLS")
 endif
 
-# mbedTLS libraries rely on this define to build correctly
+# mbed TLS libraries rely on this define to build correctly
 $(eval $(call add_define,MBEDTLS_KEY_ALG_ID))
 
 BL1_SOURCES			+=	${MBEDTLS_CRYPTO_SOURCES}