iio: adc: stm32: fix maximum clock rate for stm32mp15x

stable inclusion
from stable-v5.10.127
commit 3e0af68b99b8aab0a3b7e2a92292825d001a5cc2
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5XDDK

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=3e0af68b99b8aab0a3b7e2a92292825d001a5cc2



--------------------------------

commit 99053948 upstream.

Change maximum STM32 ADC input clock rate to 36MHz, as specified
in STM32MP15x datasheets.

Fixes: d58c67d1 ("iio: adc: stm32-adc: add support for STM32MP1")
Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
Reviewed-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20220609095234.375925-1-olivier.moysan@foss.st.com


Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: Wei Li <liwei391@huawei.com>