media: camss: csid: fix wrong size passed to devm_kmalloc_array()

'supplies' is a pointer, the real size of struct regulator_bulk_data
should be pass to devm_kmalloc_array().

Fixes: 0d814017 ("media: camss: Add regulator_bulk support")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>