Clean up Keystore compilation

Remove keystore module from self-extractors as
self-extractors/nvidia/staging/keymaster is a duplicate of

Clean up device/asus/grouper/keymaster/

Removed redundant TARGET_ARCH check
Removed redundant includes and cflags

Automate discovery of the non-open dependency
If BOARD_HAS_TF_CRYPTO_SST is not already defined then
check for libtf_crypto_sst in the device related vendor

Change-Id: I0f77cbc49198f1129755cf9a71ce24ae4f8c5a27
8 files changed