Convert CONFIG_MISC_INIT_F to Kconfig

This converts the following to Kconfig:
   CONFIG_MISC_INIT_F

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/configs/sandbox_spl_defconfig b/configs/sandbox_spl_defconfig
index ac71cab..0e40b17 100644
--- a/configs/sandbox_spl_defconfig
+++ b/configs/sandbox_spl_defconfig
@@ -11,6 +11,7 @@
 CONFIG_SPL=y
 CONFIG_BOOTSTAGE_STASH_ADDR=0x0
 CONFIG_DEFAULT_DEVICE_TREE="sandbox"
+CONFIG_TARGET_SANDBOX_SPL=y
 CONFIG_SANDBOX_SPL=y
 CONFIG_DEBUG_UART=y
 CONFIG_DISTRO_DEFAULTS=y
@@ -27,6 +28,7 @@
 CONFIG_CONSOLE_RECORD=y
 CONFIG_CONSOLE_RECORD_OUT_SIZE=0x1000
 CONFIG_DISPLAY_BOARDINFO_LATE=y
+CONFIG_MISC_INIT_F=y
 CONFIG_HANDOFF=y
 CONFIG_SPL_BOARD_INIT=y
 CONFIG_SPL_ENV_SUPPORT=y