arm64: dts: allwinner: h6: Fix PMU compatible

arm64: dts: allwinner: h6: Fix PMU compatible

commit 2bf09773333ce6862033ad66e53730e954a62b27 upstream.

The commit 0616d692d35b ("arm64: dts: allwinner: H6: Add PMU mode")
introduced support for the PMU found on the Allwinner H6. However, the
binding only allows for a single compatible, while the patch was adding
two.

Make sure we follow the binding.

Fixes: 0616d692d35b ("arm64: dts: allwinner: H6: Add PMU mode")
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>