drivers: usb: stm32: fix logic for USB clock configuration

- If the peripheral is OTG_HS with ULPI, enable the OTG_HS ULPI clock
  - The constant has a slightly different name on stm32h7
- Otherwise, if the peripheral is OTG_HS:
  - Disable the OTG_HS ULPI clock in sleep/low power mode,
  - If the peripheral is OTG_HS with PHYC[1], enable the PHYC clock.
- Otherwise, if the peripheral is OTG_FS[2] on stm32h7, also disable the
  OTG_FS ULPI clock in sleep mode (in the device/ driver, this is done in
  usb_dc_stm32_init()),

[1]: Internal HS PHY in stm32f7x2xx and (some) stm32f730xx
[2]: "OTG_FS" on stm32h7 is really just another OTG_HS peripheral, but
without any way to actually connect a HS PHY

Signed-off-by: Armin Brauns <armin.brauns@embedded-solutions.at>