staging: rts_pstor: MSXC card power class

1, Initialize chip->ms_power_class_en in rtsx_init_options;
2, In reset_ms_pro, set different initial value of change_power_class
according to chip->ms_power_class_en.

Signed-off-by: wwang <wei_wang@realsil.com.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>