MIPS: VDSO: Remove unused gettimeofday.c

arch/mips/vdso/gettimeofday.c has been unused since commit 24640f2
("mips: Add support for generic vDSO"). Remove the dead code.

Signed-off-by: Paul Burton <[email protected]>
Fixes: 24640f2 ("mips: Add support for generic vDSO")
Cc: Vincenzo Frascino <[email protected]>
Cc: [email protected]

Author: paulburton