go/runtime/host/sgx: Autodetect SGX device name

[abukosek]

Closes #4333.

[codecov]

Codecov Report

Merging #4354 (3b30b54) into master (94237e2) will decrease coverage by 0.59%.
The diff coverage is 78.57%.

@@            Coverage Diff             @@
##           master    #4354      +/-   ##
==========================================
- Coverage   69.20%   68.61%   -0.60%     
==========================================
  Files         411      411              
  Lines       47418    47431      +13     
==========================================
- Hits        32815    32543     -272     
- Misses      10587    10840     +253     
- Partials     4016     4048      +32     

Impacted Files	Coverage Δ
go/runtime/host/sgx/sgx.go	71.07% <78.57%> (-3.80%)	⬇️
go/ias/http/http.go	20.33% <0.00%> (-44.07%)	⬇️
go/oasis-node/cmd/common/metrics/disk.go	65.51% <0.00%> (-20.69%)	⬇️
go/keymanager/api/policy_sgx.go	33.33% <0.00%> (-13.34%)	⬇️
go/runtime/host/sandbox/sandbox.go	67.03% <0.00%> (-10.63%)	⬇️
go/worker/storage/service_external.go	51.19% <0.00%> (-9.53%)	⬇️
go/oasis-node/cmd/common/metrics/resource.go	84.00% <0.00%> (-8.00%)	⬇️
go/consensus/tendermint/apps/staking/auth.go	70.37% <0.00%> (-7.41%)	⬇️
go/oasis-node/cmd/ias/auth.go	68.96% <0.00%> (-6.90%)	⬇️
go/common/grpc/policy/policy.go	64.38% <0.00%> (-6.85%)	⬇️
... and 36 more

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[kostko]

Also please backport to the stable/21.3.x branch.