phy: stm32-usbphyc: add counter of PLL consumer
Add the counter of the PLL user n_pll_cons managed by the 2 functions stm32_usbphyc_pll_enable / stm32_usbphyc_pll_disable. This counter allow to remove the function stm32_usbphyc_is_init and it is a preliminary step for ck_usbo_48m introduction. Signed-off-by:Patrick Delaunay <patrick.delaunay@foss.st.com> Reviewed-by:
Patrice Chotard <patrice.chotard@foss.st.com>
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