Input: gscps2 - supply PA-RISC keyboard keymap via device property

Instead of hardcoding PA-RISC specific keycode tables into atkbd via
compile-time inclusion, have the gscps2 PS/2 port driver attach a
linux,keymap software node device property to the serio device when
a keyboard port is registered. This allows atkbd to dynamically fetch
and apply the custom keymap when probing the port using generic
firmware property helpers, removing architecture-specific hacks from
generic keyboard driver code.

Co-locate the keymap definitions with the serio port driver by moving
hpps2atkbd.h from drivers/input/keyboard/ to drivers/input/serio/.
To handle the five conflicting keys on RDI PrecisionBook laptops without
runtime model string checks or duplicate keymap tables in memory, add
CONFIG_SERIO_GSCPS2_RDI_KEYCODES to drivers/input/serio/Kconfig and
resolve the conflicting keycodes at compile time via preprocessor
macros.

Link: https://patch.msgid.link/am_9BvmZu9g4RlUM@google.com
Acked-by: Helge Deller <deller@gmx.de>
Tested-by: Helge Deller <deller@gmx.de>
Assisted-by: Antigravity:gemini-3.5-flash
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

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