firmware: sdei: Change sdei_list_lock type

When start with preempt-rt kernel, the following problem occurs.

BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:969
in_atomic(): 0, irqs_disabled(): 128, non_block: 0, pid: 17, name: cpuhp/0
3 locks held by cpuhp/0/17:
 #0: ffff800011c4bfe0 (cpu_hotplug_lock){++++}-{0:0}, at: cpuhp_thread_fun+0x50/0x29c
 #1: ffff800011c4c040 (cpuhp_state-up){+.+.}-{0:0}, at: cpuhp_thread_fun+0x90/0x29c
 #2: ffff8000124978f0 (sdei_list_lock){....}-{2:2}, at: sdei_cpuhp_up+0x40/0x130
irq event stamp: 44
hardirqs last  enabled at (43): [<ffff800010f3ae40>] _raw_spin_unlock_irq+0x50/0xc0
hardirqs last disabled at (44): [<ffff8000100446d0>] cpuhp_thread_fun+0x24c/0x29c
softirqs last  enabled at (0): [<ffff80001003f2c0>] copy_process+0x340/0x11a0
softirqs last disabled at (0): [<0000000000000000>] 0x0
CPU: 0 PID: 17 Comm: cpuhp/0 Not tainted 5.10.63-rt47-yocto-preempt-rt #1
Hardware name: Marvell OcteonTX CN96XX board (DT)
Call trace:
 dump_backtrace+0x0/0x1e0
 show_stack+0x24/0x30
 dump_stack+0xec/0x154
 ___might_sleep+0x17c/0x1f0
 rt_spin_lock+0x6c/0x10c
 sdei_cpuhp_up+0x40/0x130
 cpuhp_invoke_callback+0xb0/0x280
 cpuhp_thread_fun+0x124/0x29c
 smpboot_thread_fn+0x298/0x340
 kthread+0x174/0x180
 ret_from_fork+0x10/0x18

Change the type of sdei_list_lock from spinlock_t to raw_spinlock_t to fix.

Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>