plat-vexpress: conf: default enable CFG_PKCS11_TA_RSA_X_509

Default enable pkcs11 TA config switch CFG_PKCS11_TA_RSA_X_509 to
embed this feature in the TA test environment. Raw RSA is no more
a recommended feature but can be required for some TLS v1.2
feature support. Therefore CFG_PKCS11_TA_RSA_X_509 has been disable
in pkcs11 TA default configuration but should still be supported
hence we enable it in vexpress platforms that are intended to
test and development environments.

Signed-off-by: Etienne Carriere <[email protected]>

core/arch/arm/plat-vexpress/conf.mk

@@ -172,3 +172,4 @@ endif
 endif
 
 CFG_PKCS11_TA ?= y
+CFG_PKCS11_TA_RSA_X_509 ?= y