ext: lib: crypto: Make config-tls-generic.h default config

Default configuration of config-tls-generic.h mimics the current default
config file configuration - config-mini-tls1_2.h, thererfore it can be
safely used instead of it.

Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>
diff --git a/ext/lib/crypto/mbedtls/Kconfig b/ext/lib/crypto/mbedtls/Kconfig
index c44f960..974ab71 100644
--- a/ext/lib/crypto/mbedtls/Kconfig
+++ b/ext/lib/crypto/mbedtls/Kconfig
@@ -44,12 +44,14 @@
 config MBEDTLS_CFG_FILE
 	string "mbed TLS configuration file"
 	depends on MBEDTLS_BUILTIN
-	default "config-mini-tls1_2.h"
+	default "config-tls-generic.h"
 	help
-	  Use a specific mbed TLS configuration file. The default is suitable to
-	  communicate with majority of HTTPS servers on the Internet, but has
-	  relatively many features enabled. To optimize resources for special
-	  TLS usage, an alternative config may be selected.
+	  Use a specific mbed TLS configuration file. The default config file
+	  file can be tweaked with Kconfig. The default configuration is
+	  suitable to communicate with majority of HTTPS servers on the Internet,
+	  but has relatively many features enabled. To optimize resources for
+	  special TLS usage, use available Kconfig options, or select an
+	  alternative config.
 
 if MBEDTLS_BUILTIN && MBEDTLS_CFG_FILE = "config-tls-generic.h"
 source "ext/lib/crypto/mbedtls/Kconfig.tls-generic"