perf: imx_perf: refactor driver for imx93

This driver is initinally used to support imx93 Soc and now it's time to
add support for imx95 Soc. However, some macro definitions and events are
different on these two Socs. For preparing imx95 supports, this will
refactor driver for imx93.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Link: https://lore.kernel.org/r/20240529080358.703784-4-xu.yang_2@nxp.com
Signed-off-by: Will Deacon <will@kernel.org>