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

tools/testing/selftests/timers/Makefile

···
-all:
-	gcc posix_timers.c -o posix_timers -lrt
+CC = $(CROSS_COMPILE)gcc
+BUILD_FLAGS = -DKTEST
+CFLAGS += -O3 -Wl,-no-as-needed -Wall $(BUILD_FLAGS)
+LDFLAGS += -lrt -lpthread
+bins = posix_timers
+
+all: ${bins}
 
 run_tests: all
 	./posix_timers
 
 clean:
-	rm -f ./posix_timers
+	rm -f ${bins}