package/libdrm: tests/amdgpu needs atomic_ops

package/libdrm: tests/amdgpu needs atomic_ops

Add patch to fix tests/amdpu dependency on atomic_ops.

Fixes:

  http://autobuild.buildroot.net/results/e29dae423f3f80d2c34dde9a125bd216a75ad1c0

  FAILED: tests/amdgpu/amdgpu_test
  .../host/bin/sparc-linux-gcc  -o tests/amdgpu/amdgpu_test 'tests/amdgpu/b9f2b1d@@amdgpu_test@exe/amdgpu_test.c.o' 'tests/amdgpu/b9f2b1d@@amdgpu_test@exe/basic_tests.c.o' 'tests/amdgpu/b9f2b1d@@amdgpu_test@exe/bo_tests.c.o' 'tests/amdgpu/b9f2b1d@@amdgpu_test@exe/cs_tests.c.o' 'tests/amdgpu/b9f2b1d@@amdgpu_test@exe/vce_tests.c.o' 'tests/amdgpu/b9f2b1d@@amdgpu_test@exe/uvd_enc_tests.c.o' 'tests/amdgpu/b9f2b1d@@amdgpu_test@exe/vcn_tests.c.o' 'tests/amdgpu/b9f2b1d@@amdgpu_test@exe/deadlock_tests.c.o' 'tests/amdgpu/b9f2b1d@@amdgpu_test@exe/vm_tests.c.o' 'tests/amdgpu/b9f2b1d@@amdgpu_test@exe/ras_tests.c.o' 'tests/amdgpu/b9f2b1d@@amdgpu_test@exe/syncobj_tests.c.o' -Wl,--as-needed -Wl,--no-undefined -Wl,-O1 -Wl,--start-group libdrm.so.2.4.0 amdgpu/libdrm_amdgpu.so.1.0.0 .../host/sparc-buildroot-linux-uclibc/sysroot/usr/lib/libcunit.so -Wl,--end-group -pthread '-Wl,-rpath,$ORIGIN/../..:$ORIGIN/../../amdgpu' -Wl,-rpath-link,.../build/libdrm-2.4.100/build/ -Wl,-rpath-link,.../build/li
 bdrm-2.4.100/build/amdgpu
  .../host/opt/ext-toolchain/bin/../lib/gcc/sparc-buildroot-linux-uclibc/8.3.0/../../../../sparc-buildroot-linux-uclibc/bin/ld: tests/amdgpu/b9f2b1d@@amdgpu_test@exe/bo_tests.c.o: undefined reference to symbol 'AO_fetch_compare_and_swap_emulation'
  .../host/opt/ext-toolchain/bin/../lib/gcc/sparc-buildroot-linux-uclibc/8.3.0/../../../../sparc-buildroot-linux-uclibc/bin/ld: .../host/sparc-buildroot-linux-uclibc/sysroot/usr/lib/libatomic_ops.so.1: error adding symbols: DSO missing from command line

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>