regulator: qcom: Add labibb driverdev/labibb_upstreaming

Qualcomm platforms have LAB(LCD AMOLED Boost)/IBB(Inverting Buck Boost)
regulators, labibb for short, which are used as power supply for
LCD Mode displays.

This patch adds labibb regulator driver for pmi8998 PMIC, found on
SDM845 platforms.

Signed-off-by: Nisha Kumari <nishakumari@codeaurora.org>
  [sumits: reworked the driver design as per upstream review]
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Change-Id: I92ce375ca06fcf2c7fa0d7e4e743bf6a9f0c8414

---
v5: sumits: review comments addressed
     - removed dev_info about registering
     - removed of_get_child_by_name()
     - changed from using STATUS1 register to using ENABLE_CTL; this
       allows us to use the regulator_*_regmap helpers and makes this
       code cleaner. (In limited testing, STATUS1 seemed to report the
       change faster than ENABLE_CTL, but in absence of mechanism to
       validate if the regulator has indeed fully ramped when STATUS1
       starts flagging, broonie suggested to use the slower ENABLE_CTL
       path for safety).
v4: sumits: address review comments from v3, including cleaning up
     register_labibb_regulator(), and adapted to updated meaning of
     poll_enabled_time.
v3: sumits: addressed review comments from v2; moved to use core
     regulator features like enable_time, off_on_delay, and the newly
     added poll_enabled_time. Moved the check_enabled functionality
     to core framework via poll_enabled_time.
v2: sumits: reworked the driver for more common code, and addressed
     review comments from v1

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