phy: mapphone-mdm6600: Fix pinctrl_pm handling for sleep pins

Looks like the driver sleep pins configuration is unusable. Adding the
sleep pins causes the usb phy to not respond. We need to use the default
pins in probe, and only set sleep pins at phy_mdm6600_device_power_off().

As the modem can also be booted to a serial port mode for firmware
flashing, let's make the pin changes limited to probe and remove. For
probe, we get the default pins automatically. We only need to set the
sleep pins in phy_mdm6600_device_power_off() to prevent the modem from
waking up because the gpio line glitches.

If it turns out that we need a separate state for phy_mdm6600_power_on()
and phy_mdm6600_power_off(), we can use the pinctrl idle state.

Cc: Ivaylo Dimitrov <[email protected]>
Cc: Merlijn Wajer <[email protected]>
Cc: Pavel Machek <[email protected]>
Cc: Sebastian Reichel <[email protected]>
Fixes: 2ad2af081622 ("phy: mapphone-mdm6600: Improve phy related runtime PM calls")
Signed-off-by: Tony Lindgren <[email protected]>
Reviewed-by: Sebastian Reichel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

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