[NOUPSTREAM] altra_cpuectlr_el1 driver can't re-insmod

[bobolmw]

The patch fixes bellow error:

• 5.15 kernel:
  altra_cpuectlr: fix re-insmod errors

• 5.10 kernel:
  5d26423 altra_cpuectlr: fix re-insmod errors

• 5.4 kernel:
  0b44c52 altra_cpuectlr: fix re-insmod errors

After "rmmod altra_cpuectlr_el1"，run "modprobe altra_cpuectlr_el1" will failed.

Error logs in kmsg:

[41987.876502] sysfs: cannot create duplicate filename '/firmware/altra_cpuectlr'
[41987.876518] CPU: 119 PID: 160544 Comm: insmod Not tainted 5.10.27-cpuectlr-el1 #10
[41987.876520] Hardware name: WIWYNN Mt.Jade Server System B81.03001.0009/Mt.Jade Motherboard, BIOS 1.5.20210426 (SCP: 1.5.20210426) 2021/04/26
[41987.876524] Call trace:
[41987.876540] dump_backtrace+0x0/0x200
[41987.876544] show_stack+0x20/0x30
[41987.876552] dump_stack+0xd0/0x128
[41987.876562] sysfs_warn_dup+0x6c/0x88
[41987.876565] sysfs_create_dir_ns+0xec/0x108
[41987.876572] kobject_add_internal+0xe0/0x3a0
[41987.876574] kobject_add+0x94/0x108
[41987.876576] kobject_create_and_add+0x3c/0x88
[41987.876580] altra_cpuectlr_init+0x30/0x10000 [altra_cpuectlr_el1]
[41987.876583] do_one_initcall+0x4c/0x280
[41987.876590] do_init_module+0x60/0x230
[41987.876595] load_module+0x1020/0x1300
[41987.876597] __do_sys_finit_module+0xbc/0x128
[41987.876599] __arm64_sys_finit_module+0x28/0x38
[41987.876604] do_el0_svc+0x98/0x268
[41987.876608] el0_svc+0x58/0x68
[41987.876611] el0_sync_handler+0xb0/0xc8
[41987.876613] el0_sync+0x174/0x180
[41987.876616] kobject_add_internal failed for altra_cpuectlr with -EEXIST, don't try to register things with the same name in the same directory.
[41987.889630] kobject_create_and_add: kobject_add error: -17
[41987.889650] altra_cpuectlr_el1: Altra cpuectlr_el1: Firmware registration failed.