[coreboot] [PATCH] Drop unneeded header from i82371eb_enable_rom.c

[Keith Hui]

A "I am alive" ping kind of patch while I continue to figure out ACPI
for 440BX boards among other things.

Drops <stdint.h> from the file. My coreboot still compiles fine
without it. abuild tested.

Signed-off-by: Keith Hui