x86/entry/32: Remove redundant irq disable code

All exceptions/interrupts return with interrupts disabled now. No point in
doing this in ASM again.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20200521202120.221223450@linutronix.de