Revise dependencies for timer-related configuration options
Revise dependencies for timer-related configuration options

Revises the relationships between several configuration options
to support a tickless kernel capabilty. Specifically:

1) SYS_CLOCK_TICKS_PER_SEC is now always defined, so that it can
be referenced by TICKLESS_KERNEL. However, SYS_CLOCK_TICKS_PER_SEC
is forced to 0 when there is no timer interrupt support.

2) NUM_TIMER_PACKETS is now forced to 0 in a microkernel system
when TICKLESS_KERNEL is enabled.

3) TIMESLICING is now disabled when TICKLESS_KERNEL is enabled.

Change-Id: Ie8bf58e7828069afe68ae9451ffbf9bc220ea35f
Signed-off-by: Allan Stephens <1038bc33971d2c23c8e2eee8dd6938c077db52dc@windriver.com>

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