mbedtls: rename tls-generic Kconfig and configuration header file

Since there's now a single Kconfig and header file for Mbed TLS it makes
more sense to name them:
- Kconfig.mbedtls (instead of Kconfig.tls-generic)
- config-mbedtls.h (instead config-tls-generic.h)

Signed-off-by: Valerio Setti <vsetti@baylibre.com>

modules/mbedtls/Kconfig

@@ -52,7 +52,7 @@ config CUSTOM_MBEDTLS_CFG_FILE
 config MBEDTLS_CFG_FILE
 	string "mbed TLS configuration file" if CUSTOM_MBEDTLS_CFG_FILE
 	depends on MBEDTLS_BUILTIN
-	default "config-tls-generic.h"
+	default "config-mbedtls.h"
 	help
 	  Use a specific mbedTLS configuration file. The default config file
 	  file can be tweaked with Kconfig. The default configuration is
@@ -61,7 +61,7 @@ config MBEDTLS_CFG_FILE
 	  special TLS usage, use available Kconfig options, or select an
 	  alternative config.
 
-rsource "Kconfig.tls-generic"
+rsource "Kconfig.mbedtls"
 
 config MBEDTLS_SSL_MAX_CONTENT_LEN
 	int "Max payload size for TLS protocol message"

modules/mbedtls/Kconfig.mbedtls

@@ -5,7 +5,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 menu "Mbed TLS configuration"
-	depends on MBEDTLS_BUILTIN && MBEDTLS_CFG_FILE = "config-tls-generic.h"
+	depends on MBEDTLS_BUILTIN && MBEDTLS_CFG_FILE = "config-mbedtls.h"
 
 menu "TLS"