x86/signal: kill dependency on time.h

this is unecessary, and was pulling in printk.h from uapi headers
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

arch/x86/include/uapi/asm/signal.h

@@ -4,7 +4,6 @@
 
 #ifndef __ASSEMBLY__
 #include <linux/types.h>
-#include <linux/time.h>
 #include <linux/compiler.h>
 
 /* Avoid too many header ordering problems.  */