Require CONFIG_HID_PLAYSTATION for DualSense key layout

Some olders kernels don't yet support HID_PLAYSTATION. While they are
working on supporting this driver, provide this temporary solution.

Before this patch, if the key layout is loaded, but there is no
HID_PLAYSTATION, then the mappings on the device will be incorrect.

With this patch, this key layout will not be loaded unless there is a
CONFIG_HID_PLAYSTATION enabled on the device.

Instead, when the main layout cannot be loaded, we make another attempt
to load a fallback layout. This way, the mappings on DualSense can be
correct even if the HID_PLAYSTATION module is not loaded.

In this CL, the fallback layout was tested using controllerTester.

Bug: 228005926
Test: tested mappings with a DualSense controller on a device that does
not have CONFIG_HID_PLAYSTATION

Change-Id: I7e46ae1943cd2c63b8c0b03fdf5d71adeea89f6f