arm: riscv: Remove additional ifdef from code guarded by CONFIG_IS_ENABLED

CONFIG_OF_LIBFDT is used twice for guarding the same code. It is enough to
do it once that's why remove additional ifdefs from arm and risc-v code.

Fixes: 0c303f9a6628 ("image: Drop IMAGE_ENABLE_OF_LIBFDT")
Signed-off-by: Michal Simek <michal.simek@amd.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Link: https://lore.kernel.org/r/f8e3ff9124195cbd957874de9a65ef79760ef5e7.1657183634.git.michal.simek@amd.com
diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
index a59a5e6..fc22bef 100644
--- a/arch/arm/lib/bootm.c
+++ b/arch/arm/lib/bootm.c
@@ -200,12 +200,10 @@
 	char *commandline = env_get("bootargs");
 
 	if (CONFIG_IS_ENABLED(OF_LIBFDT) && images->ft_len) {
-#ifdef CONFIG_OF_LIBFDT
 		debug("using: FDT\n");
 		if (image_setup_linux(images)) {
 			panic("FDT creation failed!");
 		}
-#endif
 	} else if (BOOTM_ENABLE_TAGS) {
 		debug("using: ATAGS\n");
 		setup_start_tag(gd->bd);
diff --git a/arch/riscv/lib/bootm.c b/arch/riscv/lib/bootm.c
index 2e1e286..c1ac339 100644
--- a/arch/riscv/lib/bootm.c
+++ b/arch/riscv/lib/bootm.c
@@ -65,13 +65,11 @@
 static void boot_prep_linux(bootm_headers_t *images)
 {
 	if (CONFIG_IS_ENABLED(OF_LIBFDT) && images->ft_len) {
-#ifdef CONFIG_OF_LIBFDT
 		debug("using: FDT\n");
 		if (image_setup_linux(images)) {
 			printf("FDT creation failed! hanging...");
 			hang();
 		}
-#endif
 	} else {
 		printf("Device tree not found or missing FDT support\n");
 		hang();