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/hikey_defconfig b/configs/hikey_defconfig
index 12cba86..9f1ce4e 100644
--- a/configs/hikey_defconfig
+++ b/configs/hikey_defconfig
@@ -8,6 +8,7 @@
 CONFIG_DEFAULT_DEVICE_TREE="hi6220-hikey"
 CONFIG_IDENT_STRING="hikey"
 CONFIG_DISTRO_DEFAULTS=y
+CONFIG_REMAKE_ELF=y
 CONFIG_SYS_LOAD_ADDR=0x80000
 CONFIG_BOOTDELAY=10
 CONFIG_USE_BOOTARGS=y