platform/x86: x86-android-tablets: Add depends on PMIC_OPREGION

Add a depends on PMIC_OPREGION to x86-android-tablets Kconfig to fix
the following build error:

ERROR: modpost: "intel_soc_pmic_exec_mipi_pmic_seq_element"
 [drivers/platform/x86/x86-android-tablets/x86-android-tablets.ko] undefined!

Fixes: 9b1d2662

 ("platform/x86: x86-android-tablets: Add touchscreen support for Lenovo Yoga Tab 3 Pro YT3-X90F")
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/oe-kbuild-all/202303091711.howZNrIY-lkp@intel.com/
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230309094035.18736-1-hdegoede@redhat.com