Fix Issue with LPC40xx UART Baud Rate Calculation

[kammce]

• Use a constexpr table of baudrate fractional dividers and simplify parts of the baud rate calculation.

• Replace broken fractional divider estimation, which genearted values above and below 1.1 and 1.9, with table which ensure that the values within are either 0 or 1.1 to 1.9.

• Fix issue with sjsu::lpc40xx::SetMaximumSpeed() where it can cause problems with interrupts. Now it will disable interrupts during the system speed transition.

• Fix issue with esp8266 demo where there is a print statement between the socket write and socket read which, for devices without UART DMA support results in missing data the length of time the print occurs.

[codecov[bot]]

Codecov Report

Merging #1449 (20dcd64) into master (e2285c1) will decrease coverage by 0.2%. The diff coverage is 27.3%.

@@           Coverage Diff            @@
##           master   #1449     +/-   ##
========================================
- Coverage    60.0%   59.8%   -0.1%     
========================================
  Files          94      94             
  Lines        4507    4516      +9     
  Branches      968     970      +2     
========================================
- Hits         2701    2699      -2     
- Misses       1578    1588     +10     
- Partials      228     229      +1     

Impacted Files	Coverage Δ
library/peripherals/lpc40xx/system_controller.hpp	56.4% <ø> (ø)
library/peripherals/lpc40xx/uart.hpp	61.7% <27.3%> (-6.8%)	:arrow_down:
library/peripherals/lpc17xx/system_controller.hpp	93.3% <0.0%> (+0.6%)	:arrow_up:

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