amdgpu: add navi14 TA firmware from 20.10

This adds the navi14 trusted application firmware.

From internal commit:
cf61009c632768f6ca80f62a8506fd0b236d0cb6
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>

WHENCE

@@ -2308,6 +2308,7 @@ File: amdgpu/navi14_sdma1.bin
 File: amdgpu/navi14_smc.bin
 File: amdgpu/navi14_sos.bin
 File: amdgpu/navi14_vcn.bin
+File: amdgpu/navi14_ta.bin
 File: amdgpu/renoir_asd.bin
 File: amdgpu/renoir_ce.bin
 File: amdgpu/renoir_gpu_info.bin