CryptoPkg/OpensslLib: Drop dependency on ArmSoftFloatLib

Drop the ArmSoftFloatLib dependency from the OpensslLib implementations,
so that we can retire this git submodule and associated dependencies in
other components.

The upshot of this is that OpenSSL can no longer be used on 32-bit ARM
by components that rely on the random number generation routines (which
is where the floating point usage resides). In practice, this means that
ARM platforms should use MbedTLs instead for things like signed
capsules, authenticated variables and TPM2 support. HTTPS boot is no
longer supported, as TlsDxe depends on OpensslLib directly.

Note that MbedTLS itself -surprisingly- depends on OpensslLib as well,
but only for the SM3 routines, and incorporating those does not require
softfloat support.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

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