bootloader_common_get_rtc_retain_mem_partition() function
Returns partition from rtc_retain_mem Uses to get the partition of application which was worked before to go to the deep sleep. This partition was stored in rtc_retain_mem. Note: This function operates the RTC FAST memory which available only for PRO_CPU. Make sure that this function is used only PRO_CPU.
Return value
partition: If rtc_retain_mem is valid. - NULL: If it is not valid.