Remote-update: watchdog timer

I've got application image to configure successfully, to do it:

1. added this "r_read_source[1:0] <= 2'b0;" before wiriting, it seems with r_read_source set to 01 it was behaving weirdly;

2. boot address supplied should be already without two least significant bits, thus "r_data_in[23:0] <= 24'h02_0000;", however some documentation was stating that these bits are automatically removed from 24-bit vector.

But the status register issue is still there.