scsi: ufs: core: Start the RTC update work later

In the Linux kernel, the following vulnerability has been resolved:

scsi: ufs: core: Start the RTC update work later

The RTC update work involves runtime resuming the UFS controller. Hence,

only start the RTC update work after runtime power management in the UFS

driver has been fully initialized. This patch fixes the following kernel

crash:

Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP

Workqueue: events ufshcd_rtc_work

Call trace:

_raw_spin_lock_irqsave+0x34/0x8c (P)

pm_runtime_get_if_active+0x24/0x9c (L)

pm_runtime_get_if_active+0x24/0x9c

ufshcd_rtc_work+0x138/0x1b4

process_one_work+0x148/0x288

worker_thread+0x2cc/0x3d4

kthread+0x110/0x114

ret_from_fork+0x10/0x20