WFI resumes execution unconditionally on supervisor external interrupt

[ezelioli]

When the core is stalling due to a wfi, the execution is resumed if a supervisor external interrupt is raised, regardless of the respective enable bit in MIE.

PR #765 already addressed this issue for other interrupt lines, but this specific one was left out. Is there any reason for this? Otherwise, I would see the same limitations mentioned in that PR.

cva6/core/csr_regfile.sv

Lines 2362 to 2365 in 45aa060

	// if there is any (enabled) interrupt pending un-stall the core
	// also un-stall if we want to enter debug mode
	if (|(mip_q & mie_q) || (CVA6Cfg.DebugEn && debug_req_i) || irq_i[1]) begin
	wfi_d = 1'b0;