i2c(8) Support for I2CRDRW and change scan output

[manu_bidouilliste.com]

Summary

Creating a reviews based on my bugzilla entry: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198817

This add support for I2CRDRW ioctl (with option -x)
This also change the way scan outputs its result (this was asked from loos@ on irc a long time ago)

Test Plan

Apply patch and test i2c on a system with a without I2CRDRW.

[wblock]

usr.sbin/i2c/i2c.8

29

Please bump this.

68

Kind of confusingly worded. How about:

8-bit hex address of the I2C device on which to operate.

94

The first sentence can be added to the end of the previous sentence:

scan the bus for devices and print a table of all addresses.

Then start the second sentence on a new line and s/those/these/

The content of each cell can have these meanings:

103

s/An/A/

Should that really be "if", or is it meant to be "of"?

106

"the" and "ones" are not needed:

Use the I2CRDRW ioctl instead of I2CREAD/I2CWRITE.

[manu_bidouilliste.com]

Fixes a few sentences.
Bump .Dd

[manu_bidouilliste.com]

usr.sbin/i2c/i2c.8

103

Both are correct for me but english isn't my native language so it might be better otherway.
I've changed it, tell me if it suits you.

[wblock]

usr.sbin/i2c/i2c.8

66–68

As below, how about:

7-bit hex address of the I2C device.

68

Missed a couple of things:

8-bit hex address of the I2C device on which to operate.

I'm actually not sure the last part of that is needed at all. How about:

8-bit hex address of the I2C device.

93–107

s/address/addresses/

94

s/those/these/

103

Looks good now, thanks!

106

Sorry, it needs the first "the":

Use **the** I2CRDRW ioctl instead of I2CREAD/I2CWRITE.

[manu_bidouilliste.com]

Fix a few words/sentences.

[wblock]

Just a couple of minor things. I will go back through and review later, but I think this is everything. Thank you!

usr.sbin/i2c/i2c.8

66–68

s/on/of/

68

s/on/of/

[manu_bidouilliste.com]

s/on/of

[wblock]

usr.sbin/i2c/i2c.8

101

This should be
"XX" The address was skipped
.Pq see Fl n

(Untested, but I think that is correct.)

[manu_bidouilliste.com]

I'll submit a new one after 11 is branched.