x86: Remove unnecessary call to initr_enable_interrupts()

Actually initr_enable_interrupts() was never called in an x86 build
due to it was wrapped by CONFIG_x86 (typo of X86).

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>