MLK-25473-3 dmaengine: imx-sdma: split request firmware from runtime

MLK-25473-3 dmaengine: imx-sdma: split request firmware from runtime

split request_firmware from sdma_runtime_resume, because in nfs case,
request_firmware may trigger sleep which cause kernel below complain during
runtime_get_sync in atmoic case like audio record. Actually, only one time
for request_firmware after kernel boot, split it from runtime resume and
only load_scripts instead 'request_firmware + load_script'.

[   63.115924] BUG: scheduling while atomic: arecord/613/0x00000002
[   63.121970] Modules linked in:
[   63.125031] CPU: 3 PID: 613 Comm: arecord Not tainted 5.10.31-104197-ged911ffb5e2f #339
[   63.133033] Hardware name: NXP i.MX8MPlus EVK board (DT)
[   63.138343] Call trace:
[   63.140795]  dump_backtrace+0x0/0x1c8
[   63.144458]  show_stack+0x14/0x60
[   63.147775]  dump_stack+0xd0/0x128
[   63.151178]  __schedule_bug+0x54/0x78
[   63.154843]  __schedule+0x5c8/0x690
[   63.158332]  schedule+0x6c/0x108
[   63.161560]  rpc_wait_bit_killable+0x24/0xa8
[   63.165831]  __wait_on_bit+0xa4/0xe0
[   63.169405]  out_of_line_wait_on_bit+0x8c/0xb0
[   63.173848]  __rpc_execute+0x138/0x338
[   63.177596]  rpc_execute+0x88/0xa8
[   63.180998]  rpc_run_task+0x154/0x1a8
[   63.184661]  rpc_call_sync+0x54/0xa8
[   63.188239]  nfs3_rpc_wrapper+0x50/0xd0
[   63.192074]  nfs3_proc_access+0x7c/0xe0
[   63.195910]  nfs_do_access+0xa0/0x1b8
[   63.199571]  nfs_permission+0xac/0x1b0
[   63.203321]  inode_permission+0xdc/0x170
[   63.207243]  link_path_walk+0x1f4/0x350
[   63.211078]  path_openat+0x80/0xd50
[   63.214565]  do_file_open_root+0xa4/0x150
[   63.218576]  file_open_root+0xf4/0x178
[   63.222326]  kernel_read_file_from_path_initns+0xb0/0x138
[   63.227726]  _request_firmware+0x39c/0x588
[   63.231821]  request_firmware+0x44/0x68
[   63.235659]  sdma_runtime_resume+0x1a0/0x280
[   63.239929]  pm_generic_runtime_resume+0x28/0x40
[   63.244546]  __genpd_runtime_resume+0x2c/0x80
[   63.248902]  genpd_runtime_resume+0x130/0x1e8
[   63.253260]  __rpm_callback+0xd8/0x150
[   63.257008]  rpm_callback+0x24/0x98
[   63.260498]  rpm_resume+0x338/0x4b0
[   63.263986]  __pm_runtime_resume+0x38/0x88
[   63.268082]  sdma_prep_dma_cyclic+0x264/0x290

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Reviewed-by: Shengjiu Wang <shengjiu.wang@nxp.com>