edk2: Update additional licenses in Readme.md

Update the list of additional licenses in Readme.md.  For additional
licenses from a git submodule, provide a link to the license file
in the remote git repository.  This makes the links in Readme.md
when viewed from the edk2 repository GitHub landing page
https://github.com/tianocore/edk2/ functional from a web browser.

* Remove references EdkCompatibilityPkg
* Update link to OpenSSL to license file in the git submodule link
  to https://github.com/openssl/openssl
* Add link to license file in the git submodule like to
  https://github.com/ucb-bar/berkeley-softfloat-3 for
  ArmSoftFloatLib

Signed-off-by: Michael D Kinney <[email protected]>
Reviewed-by: Laszlo Ersek <[email protected]>
Reviewed-by: Ard Biesheuvel <[email protected]>
Reviewed-by: Philippe Mathieu-Daude <[email protected]>

Author: mdkinney

Readme.md

@@ -12,10 +12,10 @@ contains the following components that are covered by additional licenses:
 * [MdeModulePkg/Library/LzmaCustomDecompressLib](MdeModulePkg/Library/LzmaCustomDecompressLib/LZMA-SDK-README.txt)
 * [IntelFrameworkModulePkg/Library/LzmaCustomDecompressLib/Sdk](IntelFrameworkModulePkg/Library/LzmaCustomDecompressLib/LZMA-SDK-README.txt)
 * [BaseTools/Source/C/VfrCompile/Pccts](BaseTools/Source/C/VfrCompile/Pccts/RIGHTS)
-* [EdkCompatibilityPkg/Other/Maintained/Tools/Pccts](EdkCompatibilityPkg/Other/Maintained/Tools/Pccts/README)
 * [MdeModulePkg/Universal/RegularExpressionDxe/Oniguruma](MdeModulePkg/Universal/RegularExpressionDxe/Oniguruma/README)
 * [OvmfPkg](OvmfPkg/License.txt)
-* [CryptoPkg/Library/OpensslLib/openssl](CryptoPkg/Library/OpensslLib/openssl/LICENSE)
+* [CryptoPkg/Library/OpensslLib/openssl](https://github.com/openssl/openssl/blob/50eaac9f3337667259de725451f201e784599687/LICENSE)
+* [ArmPkg/Library/ArmSoftFloatLib/berkeley-softfloat-3](https://github.com/ucb-bar/berkeley-softfloat-3/blob/b64af41c3276f97f0e181920400ee056b9c88037/COPYING.txt)
 
 The EDK II Project is composed of packages.  The maintainers for each package
 are listed in [Maintainers.txt](Maintainers.txt).