irqchip/loongson-pch-pic: Fix potential incorrect hwirq assignment

In DeviceTree path, when ht_vec_base is not zero, the hwirq of PCH PIC
will be assigned incorrectly. Because when pch_pic_domain_translate()
adds the ht_vec_base to hwirq, the hwirq does not have the ht_vec_base
subtracted when calling irq_domain_set_info().

The ht_vec_base is designed for the parent irq chip/domain of the PCH PIC.
It seems not proper to deal this in callbacks of the PCH PIC domain and
let's put this back like the initial commit ef8c01eb64ca ("irqchip: Add
Loongson PCH PIC controller").

Fixes: bcdd75c596c8 ("irqchip/loongson-pch-pic: Add ACPI init support")
Cc: [email protected]
Reviewed-by: Huacai Chen <[email protected]>
Signed-off-by: Liu Peibao <[email protected]>
Signed-off-by: Jianmin Lv <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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