move time64 socket options from arch bits to top-level sys/socket.h

now that all 32-bit archs have 64-bit time types, the values for the
time-related socket option macros can be treated as universal for
32-bit archs. the sys/socket.h mechanism for this predates
arch/generic and is instead in the top-level header.

x32, which does not use the new time64 values of the macros, already
has its own overrides, so this commit does not affect it.

arch/mips/bits/socket.h

@@ -21,11 +21,6 @@
 #define SO_ACCEPTCONN   0x1009
 #define SO_PROTOCOL     0x1028
 #define SO_DOMAIN       0x1029
-#define SO_TIMESTAMP    63
-#define SO_TIMESTAMPNS  64
-#define SO_TIMESTAMPING 65
-#define SO_RCVTIMEO     66
-#define SO_SNDTIMEO     67
 
 #define SO_NO_CHECK     11
 #define SO_PRIORITY     12