spi: pxa2xx: Narrow the Kconfig option visibility

The PCI || ACPI dependency is the historical part of the x86 support.
Narrow the Kconfig option visibility by limiting this dependency to x86.

The drop of x86 for PCI case had happened in the commit 2b49ebda
("spi/pxa2xx: allow building on a 64-bit kernel"), while the ACPI
was specifically added for Intel Lynx Point in the commit a3496855
("spi/pxa2xx: add support for Lynxpoint SPI controllers").

Note that X86 covers both 32- and 64-bit variants.
Suggested-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://msgid.link/r/20240327193138.2385910-2-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/Kconfig

@@ -817,7 +817,7 @@ config SPI_PPC4xx
 
 config SPI_PXA2XX
 	tristate "PXA2xx SSP SPI master"
-	depends on ARCH_PXA || ARCH_MMP || PCI || ACPI || COMPILE_TEST
+	depends on ARCH_PXA || ARCH_MMP || (X86 && (PCI || ACPI)) || COMPILE_TEST
 	select PXA_SSP if ARCH_PXA || ARCH_MMP
 	help
 	  This enables using a PXA2xx or Sodaville SSP port as a SPI master