kernel: remove one of two patches deactivating broken vdso support on mips

The patch target/linux/generic/patches-4.4/206-mips-disable-vdso.patch
should be sufficient.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/generic/patches-4.4/340-MIPS-deactivate-gettimeofday-vdso.patch

@@ -1,9 +0,0 @@
---- a/arch/mips/vdso/Makefile
-+++ b/arch/mips/vdso/Makefile
-@@ -1,5 +1,5 @@
- # Objects to go into the VDSO.
--obj-vdso-y := elf.o gettimeofday.o sigreturn.o
-+obj-vdso-y := elf.o sigreturn.o
- 
- # Common compiler flags between ABIs.
- ccflags-vdso := \