Revert "regulator: labibb: avail of simpler regulator registration api"

This reverts commit 0324b74b ("regulator: labibb: avail of
simpler regulator registration api").

LABIBB regulator driver still needs to obtain init_data from
the device tree not just for the regulator name but it is for
a subsequent change which will pass the parent supply name via
init_data to register with the regulator framework. Hence bring
it back.

Since of_get_regulator_init_data() is brought back, we need to
pass rdesc to that function as the number of arguments got
changed.

CRs-Fixed: 1008400
Change-Id: I027a9ddbbbf6ff0ba7886151e5336d190ac3ce25
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>