libmaple/timer_private.h: Update to support TIM9-TIM14.

Add DECLARE_RESTRICTED_GENERAL_TIMER(), for declaring general-purpose
timers with limited interrupt support -- that is, for declaring timers
9 through 14. This helps avoid wasting space on pointers to user
handlers for interrupts that don't exist.

Add dispatch_tim_9_12() and dispatch_tim_10_11_13_14(), which are
special purpose dispatch routines for these "restricted" general
purpose timers, which only try to dispatch interrupts supported by
these timers.

Change dispatch_single_irq() to check the logical and of the DIER and
SR registers for the timer whose interrupt it's dispatching. This is
necessary due to increased muxing on the timer IRQ lines caused by the
new timers. See the comment in the patch for more details. This does
add overhead on medium- and high-density STM32F1s, where the extra
check is unnecessary, but it doesn't change dispatch_single_irq()'s
semantics, and keeps the implementation simple, so we'll live with it.

These changes will also work on F2 (and F4 AFAIK), which is why
they're part of the global private timer API, as opposed to
libmaple/stm32f1/timer.c.

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>

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