dm: tpm: Drop CONFIG_DM_TPM

Now that all TPM drivers use driver model, we can drop the special driver
model CONFIG option.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Christophe Ricard<christophe-h.ricard@st.com>
diff --git a/drivers/tpm/Makefile b/drivers/tpm/Makefile
index 5748145..1d49e95 100644
--- a/drivers/tpm/Makefile
+++ b/drivers/tpm/Makefile
@@ -3,7 +3,7 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-obj-$(CONFIG_DM_TPM) += tpm-uclass.o
+obj-$(CONFIG_TPM) += tpm-uclass.o
 
 obj-$(CONFIG_TPM_ATMEL_TWI) += tpm_atmel_twi.o
 obj-$(CONFIG_TPM_TIS_INFINEON) += tpm_tis_infineon.o