Fix for Snapshot restore of GDP-Scale PVC with 'G' units fails

[shravaniphadolibm]

Pull request checklist

CNSA issue no 8820

Pull request type

Please check the type of change your PR introduces:

• [x] Bugfix
• [ ] Feature Enhancement
• [ ] Test Automation
• [ ] Code Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] Community Operator listing
• [ ] Other (please describe):

What is the current behavior?

• Snapshot restoration fails for restore size greater than pvc size (decimal unit)

What is the new behavior?

• Snapshot restore size is less than pvc capacity hence snapshot restoration is successful.

How risky is this change?

• [ ] Small, isolated change
• [x] Medium, requires regression testing
• [ ] Large, requires functional and regression testing

[shravaniphadolibm]

Image for testing : quay.io/shravanired123/ibm-spectrum-scale-csi-driver:10junetest2

[badri-pathak]

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