tpm: Move TCG functions into a separate file

The previous patch is moving the TPM TCG headers in their own file for
a cleaner API. Move the functions in their own file as well.

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/lib/Makefile b/lib/Makefile
index 2a76acf..e389ad0 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -61,6 +61,8 @@
 obj-$(CONFIG_TPM) += tpm_api.o
 obj-$(CONFIG_TPM_V1) += tpm-v1.o
 obj-$(CONFIG_TPM_V2) += tpm-v2.o
+obj-$(CONFIG_EFI_TCG2_PROTOCOL) += tpm_tcg2.o
+obj-$(CONFIG_MEASURED_BOOT) += tpm_tcg2.o
 endif
 
 obj-$(CONFIG_$(SPL_TPL_)CRC8) += crc8.o