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/imx8ulp_evk_defconfig b/configs/imx8ulp_evk_defconfig
index b444713..0e2a646 100644
--- a/configs/imx8ulp_evk_defconfig
+++ b/configs/imx8ulp_evk_defconfig
@@ -19,6 +19,7 @@
 CONFIG_SPL_IMX_ROMAPI_LOADADDR=0x88000000
 CONFIG_SPL_LOAD_IMX_CONTAINER=y
 CONFIG_DISTRO_DEFAULTS=y
+CONFIG_REMAKE_ELF=y
 CONFIG_SYS_LOAD_ADDR=0x80480000
 CONFIG_FIT=y
 CONFIG_FIT_VERBOSE=y