tpm: make TPM_V2 be compiled by default

TPM_V1 was already compiled by default. Now that both can be compiled
at the same time, compiled them both by default.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/tpm/Kconfig

@@ -120,6 +120,7 @@ endif # TPM_V1
 config TPM_V2
 	bool "TPMv2.x support"
 	depends on TPM
+	default y
 	help
 	  Major TPM versions are not compatible at all, choose either
 	  one or the other. This option enables TPMv2.x drivers/commands.