ci.yaml: add PrEval entry (microsoft#169)

## Description

Adds a PrEval entry to all ci.yaml files to enable PrEval Policy 5.

- [ ] Impacts functionality?
- **Functionality** - Does the change ultimately impact how firmware
functions?
- Examples: Add a new library, publish a new PPI, update an algorithm,
...
- [ ] Impacts security?
- **Security** - Does the change have a direct security impact on an
application,
    flow, or firmware?
  - Examples: Crypto algorithm change, buffer overflow fix, parameter
    validation improvement, ...
- [ ] Breaking change?
- **Breaking change** - Will anyone consuming this change experience a
break
    in build or boot behavior?
- Examples: Add a new library class, move a module to a different repo,
call
    a function in a new library class in a pre-existing module, ...
- [ ] Includes tests?
  - **Tests** - Does the change include any explicit test code?
  - Examples: Unit tests, integration tests, robot tests, ...
- [ ] Includes documentation?
- **Documentation** - Does the change contain explicit documentation
additions
    outside direct code modifications (and comments)?
- Examples: Update readme file, add feature readme file, link to
documentation
    on an a separate Web page, ...

## How This Was Tested

N/A

## Integration Instructions

N/A

BoardModulePkg/BoardModulePkg.ci.yaml

@@ -6,6 +6,9 @@
 # SPDX-License-Identifier: BSD-2-Clause-Patent
 ##
 {
+    "PrEval": {
+        "DscPath": "BoardModulePkg.dsc",
+    },
     ## options defined .pytool/Plugin/LicenseCheck
     "LicenseCheck": {
         "IgnoreFiles": []

MinPlatformPkg/MinPlatformPkg.ci.yaml

@@ -6,6 +6,9 @@
 # SPDX-License-Identifier: BSD-2-Clause-Patent
 ##
 {
+    "PrEval": {
+        "DscPath": "MinPlatformPkg.dsc",
+    },
     ## options defined .pytool/Plugin/LicenseCheck
     "LicenseCheck": {
         "IgnoreFiles": []