fix: use mstatus.MIE for critical_section on qingke_v2#16
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CH32V003 (qingke_v2) does not have gintenr register (CSR 0x800). Use standard RISC-V mstatus.MIE instead for critical section implementation. Also add #[cfg(not(qingke_v2))] to gintenr module to prevent misuse. Fixes #15
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CH32V003 (qingke_v2) does not have gintenr register (CSR 0x800). Use standard RISC-V mstatus.MIE instead for critical section implementation.
Also add #[cfg(not(qingke_v2))] to gintenr module to prevent misuse.
Fixes #15