STM32 RTC: Add retry to initialization logic.  Sometime RTC initialization takes longer.  From dlsitzer.

Configuration has CC3000_SPI_MODE settings but source uses CONFIG_CC3000_SPIMODE. From Jussi Kivilinna

Make sure that all references to up_prioritize_irq() are conditioned on CONFIG_ARCH_IRQPRIO.  Noted by Make Smith

Make sure that all references to up_prioritize_irq() are conditioned on CONFIG_ARCH_IRQPRIO.  Noted by Make Smith

Add an alternate STM32 I2C driver that works around errata in the F103 chip (and maybe others).  From Patrizio Simona

STM32 I2C: Bring in PX4 fix for I2C in very high noise environments or with rogue perpipherals.  Taken from the PX4 commit by Tridge