accel/amdxdna: Create common PSP interfaces for AIE2 and AIE4

accel/amdxdna: Create common PSP interfaces for AIE2 and AIE4

The AIE2 and AIE4 use the similar interface to PSP (Platform Security
Processor). Move the PSP implementation into aie_psp.c so both platforms
use the same path and future AIE4 PSP work can build on it.

Co-developed-by: Hayden Laccabue <Hayden.Laccabue@amd.com>
Signed-off-by: Hayden Laccabue <Hayden.Laccabue@amd.com>
Signed-off-by: David Zhang <yidong.zhang@amd.com>
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
Signed-off-by: Lizhi Hou <lizhi.hou@amd.com>
Link: https://patch.msgid.link/20260330163705.3153647-4-lizhi.hou@amd.com