selftests/timers: Cleanup Makefile to make it easier to add future tests

Try to streamline the makefile so its easier to add timer/timekeeping
tests.

Also adds support for the CROSS_COMPILE variable.

Cc: Shuah Khan <[email protected]>
Cc: Prarit Bhargava <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Richard Cochran <[email protected]>
Signed-off-by: John Stultz <[email protected]>
Tested-by: Prarit Bhargava <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

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