rl78: Add macros for PIOR0, PIOR1

Signed-off-by: Paul Cercueil <paul.cercueil@analog.com>
rl78: Add code for UART1

The UART1 can be selected as the debug output by having the compiler
constant PLATFORM_USE_UART1 defined in platform-conf.h

Signed-off-by: Paul Cercueil <paul.cercueil@analog.com>
Update RL78 CPU code
Add support for R5F104PJ RL78-G14 CPU
Add driver for ADF7242 802.15.4 wireless radio
platform/yrdkrl78-g14: Added platform
Fix debug messages without spaces
Some test changes to er-rest-example