IOMUX: Preserve console list if realloc() fails

IOMUX: Preserve console list if realloc() fails

It's realloc() 101 to avoid `foo = realloc(foo, ...);` call
due to getting a memory leak.

Actually it's not clear why realloc() has been used here.
If we shrink the array, the memcpy() overwrites it anyway
with the contents of a new array. If it becomes bigger,
same story.

Drop useless realloc() for good and thus preserve console list
in case of failed allocation.

Fixes: 16a28ef219c2 ("IOMUX: Add console multiplexing support.")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>