x86 acpi: remove ALIGN_CURRENT macro

The ALIGN_CURRENT macro relied on a local variable name
as well as being defined in numerous compilation units.
Replace those instances with an acpi_align_current()
inline function.

Change-Id: Iab453f2eda1addefad8a1c37d265f917bd803202
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/12707
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/soc/intel/skylake/igd.c

@@ -177,7 +177,7 @@ static unsigned long write_acpi_igd_opregion(device_t device,
 	opregion = (igd_opregion_t *)current;
 	init_igd_opregion(opregion);
 	current += sizeof(igd_opregion_t);
-	ALIGN_CURRENT;
+	current = acpi_align_current(current);
 
 	printk(BIOS_DEBUG, "current = %lx\n", current);
 	return current;