[coreboot] [PATCH] superiotool: Add dump support for it8726f

[Josh]

I used the it8718f dump code as a reference for how to do this.
There was one value that I wasn't sure about.

0x72 Watch Dog Timer Configuration Register
ldn     idx     def
0x7     0x72    0x20            it8718f superiotool code
0x7     0x72    001s0000h       it8718f datasheet
0x7     0x72    001s0000h       it8726f datasheet

I wasn't really sure what the s in 001s0000h meant, and couldn't
figure out why it would be 0x20, but i went with 0x20 because
that's what's in the code.
superiotool -d shows the value as 0x00 for me.

Josh