sandbox: Move CONFIG_TPM_TIS_SANDBOX to Kconfig

Move this over to Kconfig and tidy up.

Signed-off-by: Simon Glass <sjg@chromium.org>

configs/sandbox_defconfig

@@ -22,3 +22,4 @@ CONFIG_SYS_VSNPRINTF=y
 CONFIG_SYS_I2C_SANDBOX=y
 CONFIG_SANDBOX_SPI=y
 CONFIG_SPI_FLASH_SANDBOX=y
+CONFIG_TPM_TIS_SANDBOX=y

drivers/tpm/Kconfig

+config TPM_TIS_SANDBOX
+	bool "Enable sandbox TPM driver"
+	help
+	  This driver emulates a TPM, providing access to base functions
+	  such as reading and writing TPM private data. This is enough to
+	  support Chrome OS verified boot. Extend functionality is not
+	  implemented.

include/configs/sandbox.h

@@ -145,8 +145,6 @@
 #define CONFIG_SHA1
 #define CONFIG_SHA256
 
-#define CONFIG_TPM_TIS_SANDBOX
-
 #define CONFIG_CMD_SANDBOX
 
 #define CONFIG_BOOTARGS ""
@@ -196,8 +194,6 @@
 #define CONFIG_LZO
 #define CONFIG_LZMA
 
-#define CONFIG_TPM_TIS_SANDBOX
-
 #define CONFIG_CMD_LZMADEC
 #define CONFIG_CMD_USB