Since the sunxi support nowadays generally prefers #defined register
offsets instead of modeling register layouts using C structs, now is a
good time to do this for PSCI as well. This patch moves away from using
the structs `sunxi_cpucfg_reg` and `sunxi_prcm_reg` in psci.c.
The former struct and its associated header file existed only to support
PSCI code, so also delete them altogether.
Signed-off-by: Sam Edwards <CFSworks@gmail.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
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