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/imx8qm_mek_defconfig b/configs/imx8qm_mek_defconfig
index c58c5ff..6a593f8 100644
--- a/configs/imx8qm_mek_defconfig
+++ b/configs/imx8qm_mek_defconfig
@@ -19,6 +19,7 @@
 CONFIG_SPL=y
 CONFIG_SPL_LOAD_IMX_CONTAINER=y
 CONFIG_IMX_CONTAINER_CFG="board/freescale/imx8qm_mek/uboot-container.cfg"
+CONFIG_REMAKE_ELF=y
 CONFIG_SYS_LOAD_ADDR=0x80280000
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_OF_SYSTEM_SETUP=y