zynqmp: Run board_get_usable_ram_top() only on main U-Boot

With commit ce39ee28ec31 ("zynqmp: Do not place u-boot to reserved memory
location"), the function board_get_usable_ram_top() is allocating
MMU_SECTION_SIZE of about 2MB using lmb_alloc(). But we dont have this
much memory in case of mini U-Boot.

Keep these functions which use lmb under CONFIG_LMB so that they are
compiled and used only when LMB is enabled.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/75e52def75f573e554a6b177a78504c128cb0c4a.1657183534.git.michal.simek@amd.com
diff --git a/arch/arc/lib/bootm.c b/arch/arc/lib/bootm.c
index ed6c5df..628addd 100644
--- a/arch/arc/lib/bootm.c
+++ b/arch/arc/lib/bootm.c
@@ -29,9 +29,11 @@
 {
 	int ret;
 
-	ret = image_setup_linux(images);
-	if (ret)
-		return ret;
+	if (CONFIG_IS_ENABLED(LMB)) {
+		ret = image_setup_linux(images);
+		if (ret)
+			return ret;
+	}
 
 	return board_prep_linux(images);
 }