sd: add proper handling for DISK_IOCTL_CTRL_SYNC

Add handling for DISK_IOCTL_CTRL_SYNC to SD subsystem. Note that
SD caching is not enabled by the SD stack, so the only required
operation to sync the disk is to wait for any active data programming
to complete.

Fixes #46689

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>