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/tests/scripts/key-exchanges.pl b/tests/scripts/key-exchanges.pl
index 20f3aa6..46f1b97 100755
--- a/tests/scripts/key-exchanges.pl
+++ b/tests/scripts/key-exchanges.pl
@@ -40,7 +40,7 @@
 -d 'library' && -d 'include' && -d 'tests' or die "Must be run from root\n";
 
 my $sed_cmd = 's/^#define \(MBEDTLS_KEY_EXCHANGE_.*_ENABLED\)/\1/p';
-my $config_h = 'include/mbedtls/config.h';
+my $config_h = 'include/mbedtls/mbedtls_config.h';
 my @kexes = split( /\s+/, `sed -n -e '$sed_cmd' $config_h` );
 
 system( "cp $config_h $config_h.bak" ) and die;