Add s1122 machine-type to associated zones.

[kishen-v]

This PR:

• Adds s1122 across available zones and updates the list of available machines.

Steps followed:

powervs-utils/region.go

Lines 9 to 12 in 7e43464

	// The system types against each zone can be fetched using either of the following:
	// 1. ibmcloud cli command
	// `ibmcloud pi datacenter ls --json | jq -r '.datacenters[] | "\(.location.region),\(.capabilitiesDetails.supportedSystems.general[])"' | sort -u`
	// 2. https://cloud.ibm.com/apidocs/power-cloud#v1-datacenters-getall (the above command uses this api underneath).

[Karthik-K-N]

Please add the source of truth in the PR description.

[mkumatag]

/lgtm

[ppc64le-cloud-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kishen-v, mkumatag

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[mkumatag]

/hold to address other review comments

[Karthik-K-N]

/lgtm

Thank you.

[kishen-v]

/unhold
Addressed all comments concerning this PR.