x86/boot/e820: Call the PCI gap a 'gap' in the boot log printout

It is a bit weird and inconsistent that the PCI gap is
advertised during bootup as 'mem'ory:

  [mem 0xc0000000-0xfed1bfff] available for PCI devices
   ^^^

It's not really memory, it's a gap that PCI devices can decode
and use and they often do not map it to any memory themselves.

So advertise it for what it is, a gap:

  [gap 0xc0000000-0xfed1bfff] available for PCI devices

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Shevchenko <andy@kernel.org>
Cc: Arnd Bergmann <arnd@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Juergen Gross <jgross@suse.com>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Paul Menzel <pmenzel@molgen.mpg.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Link: https://patch.msgid.link/20250515120549.2820541-10-mingo@kernel.org

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