Benjamin Valentin e26ed32cd6 cpu/arm7_common: simplify irq_restore()
We do not manipulate the CPSR register outside of irq_%, so we can just
restore it's previous value and don't have to fiddle with the IRQ MASK bit.

See https://www.keil.com/pack/doc/CMSIS/Core_A/html/group__CMSIS__CPSR.html
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