mfd: Kconfig: Change INTEL_SOC_PMIC_CHTDC_TI to bool

The INTEL_SOC_PMIC_CHTDC_TI should be initialized early, before
loading the fbcon driver, as otherwise the i915 driver will
fail to configure pwm:

[   13.674287] fb0: switching to inteldrmfb from EFI VGA
[   13.682380] Console: switching to colour dummy device 80x25
[   13.682468] i915 0000:00:02.0: vgaarb: deactivate vga console
[   13.682686] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[   13.685773] i915 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem
[   13.686219] i915 0000:00:02.0: [drm] *ERROR* Failed to configure the pwm chip
[   13.699572] [drm] Initialized i915 1.6.0 20200313 for 0000:00:02.0 on minor 0
[   13.739044] fbcon: i915drmfb (fb0) is primary device
[   14.037792] intel_soc_pmic_exec_mipi_pmic_seq_element: No PMIC registered
...
[   24.621403] intel_pmic_install_opregion_handler: Ask to register OpRegion for bus ID=PMI2, HID=INT33F5
[   24.630540] intel_pmic_install_opregion_handler: OpRegion registered

(some extra debug printk's were added to the above)

As suggested by Hans, this patch also addresses an issue with
the dependencies, as, for this driver to be a bool, it also
need the I2C core and the I2C_DESIGNWARE driver to be builtin.
Suggested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/86f546b3233fd799b0c39b83afc521440ebfe004.1638192232.git.mchehab+huawei@kernel.org

drivers/mfd/Kconfig

@@ -634,7 +634,7 @@ config INTEL_SOC_PMIC_CHTWC
 config INTEL_SOC_PMIC_CHTDC_TI
 	tristate "Support for Intel Cherry Trail Dollar Cove TI PMIC"
 	depends on GPIOLIB
-	depends on I2C
+	depends on I2C=y && I2C_DESIGNWARE_PLATFORM=y
 	depends on ACPI
 	depends on X86
 	select MFD_CORE
@@ -644,6 +644,10 @@ config INTEL_SOC_PMIC_CHTDC_TI
 	  Select this option for supporting Dollar Cove (TI version) PMIC
 	  device that is found on some Intel Cherry Trail systems.
 
+	  This option is a bool as it provides an ACPI OpRegion which must be
+	  available before any devices using it are probed. This option also
+	  needs the designware-i2c driver to be builtin for the same reason.
+
 config INTEL_SOC_PMIC_MRFLD
 	tristate "Support for Intel Merrifield Basin Cove PMIC"
 	depends on GPIOLIB