Update API specifications to version 1.0 beta1

Documentation generated from the PSA Crypto API documentation private
repository at tag "psa-crypto-api-1.0-beta1".

This uses some of the files include/psa/crypto*.h from the mbed-crypto
repository at tag "psa-api-1.0-beta".
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+  <td id="projectalign" style="padding-left: 0.5em;">
+   <div id="projectname">Platform Security Architecture — cryptography and keystore interface
+   &#160;<span id="projectnumber">beta 1 — 2019-01-21</span>
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+<a href="#typedef-members">Typedefs</a>  </div>
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+<div class="title">Implementation-specific definitions</div>  </div>
+</div><!--header-->
+<div class="contents">
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+<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="typedef-members"></a>
+Typedefs</h2></td></tr>
+<tr class="memitem:gabf6d5fd4e2ea89ecd425c88f057e7f75"><td class="memItemLeft" align="right" valign="top">typedef _unsigned_integral_type_&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__platform.html#gabf6d5fd4e2ea89ecd425c88f057e7f75">psa_key_handle_t</a></td></tr>
+<tr class="memdesc:gabf6d5fd4e2ea89ecd425c88f057e7f75"><td class="mdescLeft">&#160;</td><td class="mdescRight">Key handle.  <a href="#gabf6d5fd4e2ea89ecd425c88f057e7f75">More...</a><br /></td></tr>
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+<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
+<h2 class="groupheader">Typedef Documentation</h2>
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+          <td class="memname">typedef _unsigned_integral_type_ <a class="el" href="group__platform.html#gabf6d5fd4e2ea89ecd425c88f057e7f75">psa_key_handle_t</a></td>
+        </tr>
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+
+<p>Key handle. </p>
+<p>This type represents open handles to keys. It must be an unsigned integral type. The choice of type is implementation-dependent.</p>
+<p>0 is not a valid key handle. How other handle values are assigned is implementation-dependent. </p>
+
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