Fix UI flashing after changing network mode

DashboardFragment will dynamically control every preference's visibility according to preference's availability status, but EID and IMEI preference controllers have incorrect visibility control logic when these two preferences are inavailable, which leads to confliction with DashboardFragment's visibility control logic.

Remove EID and IMEI preferences's visibility settings from their controllers.

Bug: 335369817
Test: the author has tested.
Flag: EXEMPT bugfix
Change-Id: I572f9de07ff3fb8b39294d4b54b04a40a26a78ab

src/com/android/settings/network/telephony/MobileNetworkEidPreferenceController.kt

@@ -91,7 +91,6 @@ open class MobileNetworkEidPreferenceController(context: Context, key: String) :
             )
             return
         }
-        preference.isVisible = false
 
         val viewModel by lazyViewModel
         coroutineScope = viewLifecycleOwner.lifecycleScope
@@ -127,7 +126,6 @@ open class MobileNetworkEidPreferenceController(context: Context, key: String) :
         preference.title = title
         preference.dialogTitle = title
         preference.summary = eid
-        preference.isVisible = eid.isNotEmpty()
     }
 
     override fun handlePreferenceTreeClick(preference: Preference): Boolean {

src/com/android/settings/network/telephony/MobileNetworkImeiPreferenceController.kt

@@ -113,7 +113,6 @@ class MobileNetworkImeiPreferenceController(context: Context, key: String) :
     private fun refreshUi(){
         preference.title = title
         preference.summary = imei
-        preference.isVisible = true
     }
 
     override fun handlePreferenceTreeClick(preference: Preference): Boolean {