If the kernel doesn't have support for CLOCK_BOOTTIME_ALARM,
then timer_create(CLOCK_BOOTTIME_ALARM) will fail.
Added #ifdef KERNEL_MISSING_CLOCK_BOOTTIME_ALARM guard to get around
the issue. Platforms that don't have CLOCK_BOOTTIME_ALARM should have
the following lines in the device's "bdroid_buildcfg.h" file:
/* Defined if the kernel does not have support for CLOCK_BOOTTIME_ALARM */
#define KERNEL_MISSING_CLOCK_BOOTTIME_ALARM TRUE
