IRQCHIP: bcm7120-l2: Split STB-specific logic into its own function

The BCM7xxx instances of this block (listed in the register manual as
simply "IRQ0") all have the following items in common:

 - brcm,int-map-mask: for routing different bits in the L2 to different
   parent IRQs

 - brcm,int-fwd-mask: for hardwiring certain IRQs to bypass the L2 and
   use dedicated L1 lines

 - one enable/status pair (32 bits only)

Much of the driver code can be shared with BCM3380-style controllers, but
in order to do this cleanly, let's split out the BCM7xxx-specific logic
first.

Signed-off-by: Kevin Cernekee <[email protected]>
Cc: [email protected]
Cc: [email protected]
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Cc: [email protected]
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Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/8842/
Signed-off-by: Ralf Baechle <[email protected]>

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