Fix vxrm clear masks

[flaviens]

The clear mask for vxrm was cast to one bit. Keep both mask bits.

Verification: Verilator elaboration.

[Copilot]

Pull request overview

This PR fixes CSR clear-mask handling for vxrm by using the correct 2-bit vxrm_t type during mask construction, ensuring both vxrm bits are preserved/cleared as intended during CSR clear operations.

Changes:

• Update CSR_VXRM clear-mask casting to vxrm_t (instead of vxsat_e) so the mask remains 2 bits wide.
• Update CSR_VCSR clear-mask casting for the embedded vxrm field to vxrm_t.
• Document the fix in the changelog.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
hardware/src/ara_dispatcher.sv	Fixes vxrm CSR clear-mask type casting to preserve both vxrm bits in clear operations.
CHANGELOG.md	Adds a “Fixed” entry describing the vxrm clear-mask correction.

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