Convert CONFIG_REMAKE_ELF to Kconfig

This converts the following to Kconfig:
   CONFIG_REMAKE_ELF

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
diff --git a/configs/colibri-imx8x_defconfig b/configs/colibri-imx8x_defconfig
index a9b0f35..04f7f5b 100644
--- a/configs/colibri-imx8x_defconfig
+++ b/configs/colibri-imx8x_defconfig
@@ -12,6 +12,7 @@
 CONFIG_DEFAULT_DEVICE_TREE="fsl-imx8qxp-colibri"
 CONFIG_TARGET_COLIBRI_IMX8X=y
 CONFIG_DISTRO_DEFAULTS=y
+CONFIG_REMAKE_ELF=y
 CONFIG_SYS_LOAD_ADDR=0x80280000
 CONFIG_FIT=y
 CONFIG_LOG=y