power: regulator: pfuze100: Fix accessing the regulator desc

power: regulator: pfuze100: Fix accessing the regulator desc

se_desc loop check is wrong, it relies on the desc always has
the expected name to end of the loop. It works because the device tree
has the expected name as of now, but this may not be always true.

Drop se_desc by moving the check into probe and fix the loop check.

Reported-by: Andrew Goodbody <andrew.goodbody@linaro.org>
Cc: Tom Rini <trini@konsulko.com>
Cc: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>