initfs: update inputd service to register scheme 'input/evdev' (v6.0)

The v6.0 single-producer input architecture registers the input
producer scheme as 'input/evdev' (not the legacy 'input' scheme).
Without this update, the initfs would try to register 'input' but
the inputd binary would attempt to register 'input/evdev' — leading
to a 'scheme already registered' error or a missing scheme entirely.

Also update the description to reflect the v6.0 role: pure evdev
ring buffer (not the legacy VT input and graphics multiplexer).

recipes/core/base/init.initfs.d/10_inputd.service

@@ -1,6 +1,6 @@
 [unit]
-description = "VT input and graphics multiplexer"
+description = "v6.0 input/evdev ring buffer (multi-writer, single-reader)"
 
 [service]
 cmd = "inputd"
-type = { scheme = "input" }
+type = { scheme = "input/evdev" }