perf/marvell: Refactor to extract platform data

perf/marvell: Refactor to extract platform data

Introduce a refactor to the Marvell DDR pmu driver to extract platform
data ("pdata") from the existing driver. Prepare for the upcoming
support of the next version of the Performance Monitoring Unit (PMU) in
this driver.

Make no functional changes, this refactor solely improves code
organization and prepares for future enhancements.

While at it, fix a typo.

Signed-off-by: Gowthami Thiagarajan <gthiagarajan@marvell.com>
Link: https://lore.kernel.org/r/20241108040619.753343-2-gthiagarajan@marvell.com
Signed-off-by: Will Deacon <will@kernel.org>