DWC2: fix recurrent suspend ISR without Vbus connected #2873
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Describe the PR
Without Vbus connected the suspend ISR is fired every 20ms after the disconnection, which in turn calls
tud_suspend_cb()Can be easily reproduced on STM32F4-DISCO with HS pin PB14/PB15.
Additional context
It looks like the timing
TDRSMDNofFigure J-5 Device-Initiated Remote Wakeup Sequencein the databook ?