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/docs/3.0-migration-guide.d/Remove_3DES_ciphersuites.md b/docs/3.0-migration-guide.d/Remove_3DES_ciphersuites.md
index 85a85b9..0863363 100644
--- a/docs/3.0-migration-guide.d/Remove_3DES_ciphersuites.md
+++ b/docs/3.0-migration-guide.d/Remove_3DES_ciphersuites.md
@@ -1,7 +1,7 @@
 Remove 3DES ciphersuites
 --
 
-This change does not affect users using default settings for 3DES in `config.h`
+This change does not affect users using default settings for 3DES in `mbedtls_config.h`
 because the 3DES ciphersuites were disabled by that.
 
 3DES has weaknesses/limitations and there are better alternatives, and more and