Update README
Most superstitous updates to the RAMTROM driver make it more compatibile with the version used by PX4. From David Sidrane
More RAMTRON related fixes from David Sidrane
Fix some misplaced conditional compilation.  From David Sidrane
Add support for run time stack checking for the STM32.  From David Sidrane
STM32 I2C: Add strings to decode trace events.  From David Sidrane
Fix columnar alignment in Kconfig file.  From David Sidrane
Update px4fmu-v2_upstream config
ARMv7M: More runtine stack checking logic.  From David Sidrane
Refresh Configuration
EFM32 Timer/PWM:  Add support for timer/PWM EFM32GG.  From Pierre-noel Bouteville
Update ChangeLog
Back out some incorrect conditional compilation
STM32: Fix some incorrectly placed conditional logic
Serial Upper Half:  Add watermarks to RX flow control logic
Updte ChangeLog
Eliminate an unnecessary calculation in the serial RX flow control logic
Serial RX Flow Control:  Fix a bunch of compile problems introduced into unbuilt, conditioned out logic
Remove STM32-specific RX flow control logic from the upper level serial driver to the lower level STM32 serial driver
STM32 Serial: PX4 HW workarround for flaky STM32 RTS.  From David Sidrane