microblaze: Ensure CPU usermode is set on new userspace processes

Signed-off-by: John Williams <john.williams@petalogix.com>
diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c
index 00b12c6..4201c74 100644
--- a/arch/microblaze/kernel/process.c
+++ b/arch/microblaze/kernel/process.c
@@ -235,6 +235,7 @@
 	regs->pc = pc;
 	regs->r1 = usp;
 	regs->pt_mode = 0;
+	regs->msr |= MSR_UMS;
 }
 
 #ifdef CONFIG_MMU