Convert CONFIG_THOR_RESET_OFF to Kconfig

This converts the following to Kconfig:
   CONFIG_THOR_RESET_OFF

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/topic_miami_defconfig b/configs/topic_miami_defconfig
index ece625f..2ae1fb8 100644
--- a/configs/topic_miami_defconfig
+++ b/configs/topic_miami_defconfig
@@ -40,6 +40,7 @@
 CONFIG_SYS_PBSIZE=2077
 CONFIG_SYS_BOOTM_LEN=0x3c00000
 CONFIG_CMD_THOR_DOWNLOAD=y
+CONFIG_THOR_RESET_OFF=y
 CONFIG_CMD_MEMTEST=y
 CONFIG_CMD_DFU=y
 CONFIG_CMD_I2C=y