dts: arm: stm32l0 LSI clock freq is 37kHz
dts: arm: stm32l0 LSI clock freq is 37kHz

Corrects the LSI clock freq for stm32l0x mcus
especially stm32l0x1 stm32l0x2 stm32l0x3 series

Signed-off-by: Francois Ramu <b83adc7f8a23ee911a37fcb61c4033581aae0b7a@st.com>

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