You don't need them all, and they are not linked to a specific drm version.
Check which firmware is loaded
Example:
	
	
	
		Code:
	
	
		 # kldstat | grep amdgpu
0    1 0xffffffff83600000   4129b8 amdgpu.ko
17    1 0xffffffff83a9f000     64e0 amdgpu_renoir_sdma_bin.ko
18    1 0xffffffff83aa6000    2c2e0 amdgpu_renoir_asd_bin.ko
19    1 0xffffffff83ad3000     7560 amdgpu_renoir_pfp_bin.ko
20    1 0xffffffff83adb000     6560 amdgpu_renoir_me_bin.ko
21    1 0xffffffff83ae2000     4560 amdgpu_renoir_ce_bin.ko
22    1 0xffffffff83ae7000     bcd8 amdgpu_renoir_rlc_bin.ko
23    1 0xffffffff83af3000    43800 amdgpu_renoir_mec_bin.ko
24    1 0xffffffff83b37000    43800 amdgpu_renoir_mec2_bin.ko
25    1 0xffffffff83b7b000    1fbe8 amdgpu_renoir_dmcub_bin.ko
26    1 0xffffffff83b9b000    645a0 amdgpu_renoir_vcn_bin.ko
	 
 
afterwards check if the firmware is on the pkg autoremove list.
If it is listed, set the package from automatic to non-automatic, to prevent autoremove
	
	
	
		Code:
	
	
		 # pkg set -A 0 gpu-firmware-amd-kmod-renoir
	 
 
Replace 'renoir' with the GPU name of your system.
For documentation see 
pkg-set(8)