refactor hwctx fini (#332)

1. Add a function to wait for all the jobs are free. This is because drm_sched_fini() not able to handle job in some case in the current Linux driver code
2. Some more refactor because of 1)
3. add fwctx.c for hardware/firmware related operations, like create firmware context etc.
4. Some lock dep fix in mailbox.
---------

Signed-off-by: Min Ma <min.ma@amd.com>

src/driver/amdxdna/Kbuild

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 #
-# Copyright (C) 2022-2024, Advanced Micro Devices, Inc.
+# Copyright (C) 2022-2025, Advanced Micro Devices, Inc.
 #
 
 ROOT := $(src)
@@ -27,6 +27,7 @@ amdxdna-y := \
 	aie2_smu.o \
 	aie2_psp.o \
 	aie2_ctx.o \
+	aie2_fwctx.o \
 	aie2_error.o \
 	aie2_debugfs.o \
 	aie2_message.o \