Remove sha2.h which was replaced by libsodium
Remove sha2.h which was replaced by libsodium

fhunleth/fwup,edahlseng/fwup,fhunleth/fwup,michaelkschmidt/fwup,michaelkschmidt/fwup,edahlseng/fwup,michaelkschmidt/fwup,fhunleth/fwup