Added android.software.input_methods to car_core_hardware.xml

It wasn't defined before because automotive supported multi-session IME
instead, which is not the case anymore.

Test: m sync && adb sync && adb shell stop && adb shell start
Test: adb shell pm list features | grep input || echo "NOT_FOUND"
Test: atest DatasetFilteringDropdownTest#testFilter_usingKeyboard

Fixes: 149411720
Bug: 162370837

Change-Id: I8e7e4809b2c50b06c820dff75f3b24401c3b90e1