Add STM32L452 docs

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/datasheets/st/stm32l452/rm0394-stm32l41xxx42xxx43xxx44xxx45xxx46xxx-advanced-armbased-32bit-mcus-stmicroelectronics.pdf b/datasheets/st/stm32l452/rm0394-stm32l41xxx42xxx43xxx44xxx45xxx46xxx-advanced-armbased-32bit-mcus-stmicroelectronics.pdf
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diff --git a/datasheets/st/stm32l452/stm32l452re.pdf b/datasheets/st/stm32l452/stm32l452re.pdf
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