Revert "include/uapi/linux/atm_zatm.h: include linux/time.h"

Revert "include/uapi/linux/atm_zatm.h: include linux/time.h"

This reverts commit ca37d718f2b6 ("include/uapi/linux/atm_zatm.h: include
linux/time.h").

This attempted to fix userspace breakage that no longer existed when
the patch was merged.  Almost one year earlier, commit f1bfe01ffcf0
("atm: remove 'struct zatm_t_hist'") deleted the struct in question.

After this patch was merged, we now have to deal with people being
unable to include this header in conjunction with standard C library
headers like stdlib.h (which linux-atm does).  Example breakage:
x86_64-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I../.. -I./../q2931 -I./../saal \
	-I.  -DCPPFLAGS_TEST  -I../../src/include -O2 -march=native -pipe -g \
	-frecord-gcc-switches -freport-bug -Wimplicit-function-declaration \
	-Wnonnull -Wstrict-aliasing -Wparentheses -Warray-bounds \
	-Wfree-nonheap-object -Wreturn-local-addr -fno-strict-aliasing -Wall \
	-Wshadow -Wpointer-arith -Wwrite-strings -Wstrict-prototypes -c zntune.c
In file included from /usr/include/linux/atm_zatm.h:17:0,
                 from zntune.c:17:
/usr/include/linux/time.h:9:8: error: redefinition of ‘struct timespec’
 struct timespec {
        ^
In file included from /usr/include/sys/select.h:43:0,
                 from /usr/include/sys/types.h:219,
                 from /usr/include/stdlib.h:314,
                 from zntune.c:9:
/usr/include/time.h:120:8: note: originally defined here
 struct timespec
        ^

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Mikko Rapeli <mikko.rapeli@iki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>