Replace all ofnode_read_*() / ofnode_read_bool() / ofnode_get_property()
calls with their dev_read_*() equivalents across
octeontx_mmc_get_valid(), octeontx_mmc_get_config(),
octeontx_mmc_host_probe() and octeontx_mmc_host_child_pre_probe().
Remove the intermediate 'ofnode node' local variables, the now-unused
'host->node' assignment in the probe function, and the corresponding
'ofnode node' field from struct octeontx_mmc_host.
No functional change.
Signed-off-by: Peng Fan <peng.fan@nxp.com>