KVM: PPC: Book3S HV: Fix stack frame regs marker

The hard-coded marker is out of date now, fix it using the nice define.

Fixes: 17773afd ("powerpc/64: use 32-bit immediate for STACK_FRAME_REGS_MARKER")
Reported-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221006143345.129077-1-npiggin@gmail.com

arch/powerpc/kvm/book3s_hv_rmhandlers.S

@@ -2728,7 +2728,7 @@ kvmppc_bad_host_intr:
 	std	r5, _XER(r1)
 	std	r6, SOFTE(r1)
 	LOAD_PACA_TOC()
-	LOAD_REG_IMMEDIATE(3, 0x7265677368657265)
+	LOAD_REG_IMMEDIATE(3, STACK_FRAME_REGS_MARKER)
 	std	r3, STACK_FRAME_OVERHEAD-16(r1)
 
 	/*