STM32 TIM: Assure that a compilation error will occur if the old timer input clock frequency definitions are used

STM32 Timer: Generalize and extend calculation of per-timer pre-scaler value.  Inspired by original proposal from Pierre-noel Bouteville.

This reverts commit 082d3222.

Remove drivers/mtd/flash_eraseall.c.  It is not used in the OS and is just a dumb wrapper around the MDIOC_BULKERASE IOCTL call.

Fix the Value Line adc IRQ number selection

STM32F4 RTC: Remove 24 hour limit; Fix calculation of the alarm register (was not including day of the month).  Fix a bad shift value

The rtc examples "alarm 10" now runs to completion