MLK-24465-1 usb: chipidea: udc: update vbus flag for struct usb_udc correctly

At udc core, it sets vbus flag as true and call usb_gadget_connect by
default. But for chipidea udc driver, it depends on VBUS status to
call usb_gadget_connect, so it needs to set vbus flag according to
VBUS at the .udc_start. With this change, the un-necessary
usb_gadget_connect when load gadget function could be avoided.
It could fix below oops as well:

[   17.175905] BUG: scheduling while atomic: v4l_id/649/0x00000002
[   17.182016] Modules linked in: crct10dif_ce brcmfmac brcmutil synaptics_dsx_i2c fsl_imx8_ddr_perf galcore(O)
[   17.191893] CPU: 1 PID: 649 Comm: v4l_id Tainted: G           O      5.4.3-lts-lf-5.4.y+gf8118585ee3c #1
[   17.201369] Hardware name: FSL i.MX8MM DDR4 EVK RevB board (DT)
[   17.207286] Call trace:
[   17.209739]  dump_backtrace+0x0/0x140
[   17.213401]  show_stack+0x14/0x20
[   17.216717]  dump_stack+0xb4/0xf8
[   17.220033]  __schedule_bug+0x5c/0x70
[   17.223695]  __schedule+0x4b4/0x560
[   17.227181]  schedule+0x40/0xe0
[   17.230321]  schedule_hrtimeout_range_clock+0x9c/0x118
[   17.235455]  schedule_hrtimeout_range+0x10/0x18
[   17.239985]  usleep_range+0x74/0xa0
[   17.243473]  ci_controller_resume+0x90/0xd8
[   17.247652]  ci_runtime_resume+0xc/0x18
[   17.251488]  pm_generic_runtime_resume+0x28/0x40
[   17.256103]  __rpm_callback+0x88/0x140
[   17.259848]  rpm_callback+0x20/0x80
[   17.263334]  rpm_resume+0x39c/0x580
[   17.266819]  __pm_runtime_resume+0x38/0x80
[   17.270914]  ci_udc_pullup+0x40/0xf8
[   17.274489]  usb_gadget_activate+0x48/0x78
[   17.278582]  usb_function_activate+0x68/0xb8
[   17.282851]  uvc_function_connect+0x18/0x50
[   17.287031]  uvc_v4l2_open+0x5c/0x78
[   17.290607]  v4l2_open+0xa0/0x118
[   17.293922]  chrdev_open+0xa0/0x198
[   17.297408]  do_dentry_open+0x110/0x3b0
[   17.301240]  vfs_open+0x28/0x30
[   17.304381]  path_openat+0x4a0/0x1240
[   17.308040]  do_filp_open+0x74/0xf8
[   17.311525]  do_sys_open+0x168/0x218
[   17.315097]  __arm64_sys_openat+0x20/0x28
[   17.319107]  el0_svc_common.constprop.0+0x68/0x160
[   17.323898]  el0_svc_handler+0x20/0x80
[   17.327647]  el0_svc+0x8/0xc

Reviewed-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>

drivers/usb/chipidea/udc.c

@@ -1880,6 +1880,8 @@ static int ci_udc_start(struct usb_gadget *gadget,
 
 	if (ci->vbus_active)
 		ci_hdrc_gadget_connect(&ci->gadget, 1);
+	else
+		usb_udc_vbus_handler(&ci->gadget, false);
 
 	return retval;
 }