arm: tegra: xmm: baseband modem pm code cleanup

arm: tegra: xmm: baseband modem pm code cleanup

- Platform data is treated as const and not modified in driver.
- Driver specific data is stored and used from a new structure.
- Remove support for older firmware version of XMM modem (<1130).
- Shortening of names for compliance and to fit in 80 characters.
- Organize irq function to reduce indentation.

Change-Id: I269401aa0a2efc685d7a630b4952cb31cbca6a4f
Signed-off-by: Vinayak Pane <vpane@nvidia.com>
Reviewed-on: http://git-master/r/101587
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Steve Lin <stlin@nvidia.com>
Rebase-Id: R68a72fc12ab9596549f63d375744aac79d7923d5