allwinner: a64: power: Remove obsolete register check
allwinner: a64: power: Remove obsolete register check

As of a561e41bf1d2 ("allwinner: power: add enable switches for DCDC1/5")
there are no longer regulators without an enable register provided.
Since it seems reasonable that this will continue to be the case, drop
the check.

Signed-off-by: Samuel Holland <c16aab9fe3288df0fb8fc1d24990a300b6b8f299@sholland.org>
Change-Id: Icd7ec26fc6450d053e6e6d855fc16229b1d65a39

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware