feat(tpm): add tpm drivers and framework

Add tpm2 drivers to tf-a with adequate framework
-implement a fifo spi interface that works
 with discrete tpm chip.
-implement tpm command layer interfaces that are used
 to initialize, start and make measurements and
 close the interface.
-tpm drivers are built using their own make file
 to allow for ease in porting across platforms,
 and across different interfaces.

Signed-off-by: Tushar Khandelwal <tushar.khandelwal@arm.com>
Signed-off-by: Abhi Singh <abhi.singh@arm.com>
Change-Id: Ie1a189f45c80f26f4dea16c3bd71b1503709e0ea
diff --git a/Makefile b/Makefile
index e111be2..99e9189 100644
--- a/Makefile
+++ b/Makefile
@@ -1232,6 +1232,7 @@
 	HARDEN_SLS \
 	HW_ASSISTED_COHERENCY \
 	MEASURED_BOOT \
+	DISCRETE_TPM \
 	DICE_PROTECTION_ENVIRONMENT \
 	RMMD_ENABLE_EL3_TOKEN_SIGN \
 	DRTM_SUPPORT \
@@ -1418,6 +1419,7 @@
 	HW_ASSISTED_COHERENCY \
 	LOG_LEVEL \
 	MEASURED_BOOT \
+	DISCRETE_TPM \
 	DICE_PROTECTION_ENVIRONMENT \
 	DRTM_SUPPORT \
 	NS_TIMER_SWITCH \