Convert CONFIG_USE_PREBOOT and CONFIG_PREBOOT to Kconfig

This converts the following to Kconfig:
   CONFIG_USE_PREBOOT
   CONFIG_PREBOOT

Both are together in one commit, since otherwise the former causes kconfig
to define the latter, which gives duplicate symbol errors.

Includes a manual fixup for CONFIG_PREBOOT in ids8313_defconfig since the
backslash lands in the wrong place. Similarly with socfpga_vining_fpga.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/evb-rk3229_defconfig b/configs/evb-rk3229_defconfig
index 2032978..985469a 100644
--- a/configs/evb-rk3229_defconfig
+++ b/configs/evb-rk3229_defconfig
@@ -14,12 +14,12 @@
 CONFIG_FIT_VERBOSE=y
 CONFIG_SPL_LOAD_FIT=y
 CONFIG_SPL_FIT_SOURCE="arch/arm/mach-rockchip/fit_spl_optee.its"
+CONFIG_USE_PREBOOT=y
 CONFIG_DEFAULT_FDT_FILE="rk3229-evb.dtb"
 # CONFIG_DISPLAY_CPUINFO is not set
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_SPL_TEXT_BASE=0x60000000
 # CONFIG_SPL_RAW_IMAGE_SUPPORT is not set
-# CONFIG_SPL_LEGACY_IMAGE_SUPPORT is not set
 CONFIG_SPL_STACK_R=y
 CONFIG_SPL_STACK_R_MALLOC_SIMPLE_LEN=0x2000
 CONFIG_SPL_OPTEE=y
@@ -68,6 +68,5 @@
 CONFIG_USB_GADGET_PRODUCT_NUM=0x320a
 CONFIG_USB_GADGET_DWC2_OTG=y
 CONFIG_USB_FUNCTION_MASS_STORAGE=y
-CONFIG_USE_TINY_PRINTF=y
 CONFIG_TPL_TINY_MEMSET=y
 CONFIG_ERRNO_STR=y