DynamicTablesPkg/HwInfoParser: Add FdtGetInterruptMap()

A FDT interrupt nexus defines an "interrupt-map" property.
The property is an array of 5 columns as:
- child unit address
- child interrupt specifier
- interrupt-parent (phandle on 1 cell)
- parent unit address
- parent interrupt specifier

It is difficult to iterate over the lines of the
"interrupt-map" array. To determine the location of each
property in the interrupt-map, the size of the child unit
address and interrupt specifier must be fetched. The
interrupt-parent cells then allows to fetch the size of the
parent unit address and interrupt specifier.

Create a FdtGetInterruptMap() function allowing to fetch
all the properties of an interrupt-map entry.
Use the function to simplify the PCI config space parser.

Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>

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