Move serial port configuration into user of serial ports

[peterbarker]

This moves the serial port configuration into the libraries which are supposed to know how the protocol works.

We did this with many protocols, but these ones (and several more) change the baud rate to a fixed value so a user will see the expected baudrate when they download parameters. This PR adds a call onto the serial manager library to allow that to happen.

Board               AP_Periph  blimp  bootloader  copter  heli  iofirmware  plane  rover  sub
Durandal                       88     *           200     104               144    152    144
HerePro             -112                                                                  
Hitec-Airspeed      -112                                                                  
KakuteH7-bdshot                72     *           80      120               112    120    104
MatekF405                      -8     *           24      16                16     24     16
Pixhawk1-1M-bdshot             -16                -16     -16               -16    -16    -16
f103-QiotekPeriph   -112                                                                  
f303-Universal      -112                                                                  
iomcu                                                           *                         
revo-mini                      -16    *           24      16                16     16     24
skyviper-v2450                                    -16                                     

[rmackay9]

I'm happy with the mount changes at least.

[tridge]

this has potential issues:

• it means we begin() twice, first with wrong baudrate, could consume corrupted bytes
• could impact memory allocation for uarts