regulator: core: Remove duplicate copy of active-discharge parsing

Apparently due to a wrongly resolved merge conflict between two
branches, which contained the same commit, the commit contents
partially was added two times in a row.

This change reverts the latter wrong inclusion of commit 909f7ee0
("regulator: core: Add support for active-discharge configuration").

The first applied commit 670666b9 ("regulator: core: Add support
for active-discharge configuration") is not touched.

Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Cc: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>