[v4][PATCH 8/8] book3e/kexec/kdump: recover "r4 = 0" to create the initial TLB

In commit 96f013f, "powerpc/kexec: Add kexec "hold" support for Book3e processors", requires that GPR4 survive the "hold" process, for IBM Blue Gene/Q with with some very strange firmware. But for FSL Book3E, r4 = 1 to indicate that the initial TLB entry for this core already exists so we still

[v4][PATCH 8/8] book3e/kexec/kdump: recover r4 = 0 to create the initial TLB

In commit 96f013f, powerpc/kexec: Add kexec hold support for Book3e processors, requires that GPR4 survive the hold process, for IBM Blue Gene/Q with with some very strange firmware. But for FSL Book3E, r4 = 1 to indicate that the initial TLB entry for this core already exists so we still should