clk: clk_stm32f7: fix PLL clock division factor
Fix clock division factor initialization for RCC_PLLCFGR registers. PLLR bits (bit 31-28) in RCC_PLLCFGR must not be cleared, it's a forbidden value. So update RCC_PLLCFGR using clrsetbits_le32() to set only necessary bits fields. Signed-off-by: NPatrice Chotard <patrice.chotard@st.com> Reviewed-by: NSimon Glass <sjg@chromium.org>
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