feat(st-usb): enable USBOTG DFU for STM32MP21

USBOTG DFU mode is present on STM32MP21. Adapt device start and stop
sequences using STM32MP21 flag.

Change-Id: Ife8d545cedfa769f58d5c9bc0a3df8b5336b60

feat(st-usb): enable USBOTG DFU for STM32MP21

USBOTG DFU mode is present on STM32MP21. Adapt device start and stop
sequences using STM32MP21 flag.

Change-Id: Ife8d545cedfa769f58d5c9bc0a3df8b5336b60a9
Signed-off-by: Pankaj Dev <pankaj.dev@st.com>
Signed-off-by: Nicolas Le Bayon <nicolas.le.bayon@st.com>

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fix(st-usb): replace redundant checks with asserts

Returning enum usb_status in an enum usb_action function is wrong as
they have different meanings. However, usb_dwc2_ep0_out_start() and
usb_dwc2_a

fix(st-usb): replace redundant checks with asserts

Returning enum usb_status in an enum usb_action function is wrong as
they have different meanings. However, usb_dwc2_ep0_out_start() and
usb_dwc2_activate_setup() only return USBD_OK so we will never get to
there. Replace these checks with asserts in case the code changes in
future.

This also silences a warning when compiling with -Wextra.

Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: I73dfd5c189a357544c15ceb3f4268da82ce272b9

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