Replace MBEDTLS_MD_CAN_MD5 with PSA_WANT_ALG_MD5

[eleuzi01]

Description

Issue #9110.

PR checklist

Please tick as appropriate and edit the reasons (e.g.: "backport: not needed because this is a new feature")

• changelog provided, or not required
• 3.6 backport done, or not required
• 2.28 backport done, or not required
• tests provided, or not required

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