libpci: physmem-posix: Fix OFF_MAX definition

Expression ((1 << n) - 1) for n=31 has undefined behavior and gcc 11
already evaluates it to zero.

Fix definition of OFF_MAX to prevent signed integer

libpci: physmem-posix: Fix OFF_MAX definition

Expression ((1 << n) - 1) for n=31 has undefined behavior and gcc 11
already evaluates it to zero.

Fix definition of OFF_MAX to prevent signed integer overflow.

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libpci: Move physical memory mapping mmap() code from ecam/mmio-ports to physmem-posix.c file

This deduplicates physical memory mapping mmap() code found in ecam and
mmio-ports backends into common

libpci: Move physical memory mapping mmap() code from ecam/mmio-ports to physmem-posix.c file

This deduplicates physical memory mapping mmap() code found in ecam and
mmio-ports backends into common functions with new physmem API.

This new physmem API allows to implement also non-mmap() variants of
physical memory mapping.

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