regulator: pca9450: add enable_value for all bucks

Set 'enable_value' in the regulator descriptor for different bucks to
manage their enable modes:

- 00b: OFF
- 01b: ON when PMIC_ON_REQ = H
- 10b: ON when PMIC_ON_REQ = H && PMIC_STBY_REQ = L
- 11b: Always ON

Ensure appropriate behavior based on the intended design. For example:
- Buck2, designed for vddarm, should be set to '10b' (ON when
PMIC_STBY_REQ = L) since it can be off when `PMIC_STBY_REQ = H` after the
kernel enters suspend.
- Other bucks remain '01b' (ON when PMIC_ON_REQ = H), matching the default
setting. This avoids the need to re-enable them during kernel boot as they
are already enabled after PMIC initialization.

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20241205-pca9450-v1-1-aab448b74e78@nxp.com


Signed-off-by: Mark Brown <broonie@kernel.org>