regulator: max14577: fix set_mode clobbering enable on MAX77836 LDOs

So the PWRMD field in CNFG1_LDO is both the enable bit and the mode.
You can't change one without stepping on the other.

The problem is that enable() from the regulator core just writes
enable_mask (which is PWRMD_NORMAL).  If you'd called set_mode(LPM)
then disabled and re-enabled, the mode gets reset to NORMAL.  And
set_mode updates the register through the same field, so it can
accidentally enable a disabled regulator.

Fix it by storing the mode in per-regulator data.  A custom enable
writes whatever mode was last set.  set_mode only touches hardware
if the regulator is already on; otherwise it just caches the value.

Add of_map_mode while here so the initial mode can be wired from DT.

Signed-off-by: Jad Keskes <inasj268@gmail.com>
Acked-by: Lee Jones <lee@kernel.org>
Link: https://patch.msgid.link/20260617094622.1846471-1-inasj268@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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