Revert "fdt: Properly handle "no-map" field in the memory region"

This reverts commit 03972d6b1b.
It is not really a fix, and the backport misses dependencies, which
breaks existing platforms.

Reported-by: Alexandre TORGUE <alexandre.torgue@foss.st.com>
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/of/fdt.c

@@ -1173,7 +1173,7 @@ int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
 					phys_addr_t size, bool nomap)
 {
 	if (nomap)
-		return memblock_mark_nomap(base, size);
+		return memblock_remove(base, size);
 	return memblock_reserve(base, size);
 }