MIPS: GIC: Generate redirect block accessors

With CM 3.5 the "core-other" register block evolves into the "redirect"
register block, which is capable of accessing not only the core local
registers of other cores but also the shared/global registers of other
clusters.

This patch generates accessor functions for shared/global registers
accessed via the redirect block, with "redir_" inserted after "gic_" in
their names. For example the accessor function:

  read_gic_config()

...accesses the GIC_CONFIG register of the GIC in the local cluster.
With this patch a new function:

  read_gic_redir_config()

...is added which accesses the GIC_CONFIG register of the GIC in
whichever cluster the GCR_CL_REDIRECT register is configured to access.

This mirrors the similar redirect block accessors already provided for
the CM & CPC.

Reviewed-by: Jiaxun Yang <[email protected]>
Signed-off-by: Paul Burton <[email protected]>
Signed-off-by: Chao-ying Fu <[email protected]>
Signed-off-by: Dragan Mladjenovic <[email protected]>
Signed-off-by: Aleksandar Rikalo <[email protected]>
Signed-off-by: Thomas Bogendoerfer <[email protected]>

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