include/linux/time.h: define USEC_PER_SEC and friends ...

Linux has them in include/linux/time64.h and they are useful for
making (especially microsecond) use readable such as in read*_poll_timeout.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: move struct timespec to include/linux/time.h ...

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clocksource: move the NSEC_PER_SEC constant to common header ...

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

include/linux/time.h: remove dead code ...

include/linux/time.h contains several unused functions derived from U-Boot
code. Since this is a file under include/linux/ it should contain only code
from the kernel, so remove all this.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Initial revision