Rename config.h to mbedtls_config.h

This commit was generated using the following script:

# ========================
#!/bin/sh
git ls-files | grep -v '^ChangeLog' | xargs sed -b -E -i '
s/((check|crypto|full|mbedtls|query)_config)\.h/\1\nh/g
s/config\.h/mbedtls_config.h/g
y/\n/./
'
mv include/mbedtls/config.h include/mbedtls/mbedtls_config.h
# ========================

Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
diff --git a/library/entropy_poll.h b/library/entropy_poll.h
index 9edf1f1..aef1a09 100644
--- a/library/entropy_poll.h
+++ b/library/entropy_poll.h
@@ -51,7 +51,7 @@
  * \brief           Entropy poll callback for a hardware source
  *
  * \warning         This is not provided by mbed TLS!
- *                  See \c MBEDTLS_ENTROPY_HARDWARE_ALT in config.h.
+ *                  See \c MBEDTLS_ENTROPY_HARDWARE_ALT in mbedtls_config.h.
  *
  * \note            This must accept NULL as its first argument.
  */