Revert "of: reserved-memory: Fix using wrong number of cells to get property 'alignment'"

This reverts commit 0e83ec8c which is
commit 267b21d0 upstream.

It breaks Pixel systems and can be brought back in the future if it's
really needed.

Change-Id: Ic96fe3259ce2fe4186301e64cfa400057c3dba0e
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>