arm64: zynqmp: Fix Kconfig entry indentation

Use tabs instead of space for entry indentation which is standard coding
style.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/ff28e719de82258c066f1fedae87f88597f367b5.1698302068.git.michal.simek@amd.com