stm32h7: bbsram issues causing no writes and hardfaults * stm32_pwr:Ensure data is flushed on backup domain access changes * stm32h7:bbsram convince compiler to perform 32 bit write Approved-by: Gregory Nutt <gnutt@nuttx.org>
stm32h7: bbsram issues causing no writes and hardfaults * stm32_pwr:Ensure data is flushed on backup domain access changes * stm32h7:bbsram convince compiler to perform 32 bit write Approved-by: Gregory Nutt <gnutt@nuttx.org>